n. (Chem.) An organic base, especially one of a class of nitrogen-containing substances occurring ready formed in the tissues of plants and the bodies of animals. [ 1913 Webster ]

☞ Alkaloids all contain nitrogen, carbon, and hydrogen, and many of them also contain oxygen. They include many of the active principles in plants; thus, morphine and narcotine are alkaloids found in opium. [ 1913 Webster ]

{ } a. [ Alkali + -oid: cf. F. alcaloïde. ] 1. Pertaining to, resembling, or containing, alkali. [ 1913 Webster ]

2. of or pertaining to alkaloids. [ WordNet 1.5 ]

n. [ Gr. &unr_; almond + -oid: cf. F. amygdaloïde. ] (Min.) A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava. [ 1913 Webster ]

{ } a. 1. Almond-shaped. [ 1913 Webster ]

2. Pertaining to, or having the nature of, the rock amygdaloid. [ 1913 Webster ]

{ } a. [ L. amylum starch + -oid. ] Resembling or containing starch; starchlike. AS
Syn. -- starchlike, amylaceous [ 1913 Webster ]

n. 1. A starchlike substance. [ 1913 Webster + AS ]

2. (Med.) Any of a group of diverse starchlike glycoproteins deposited in the organs under some pathological conditions, such as amyloidosis; they are composed of linear nonbranching fibrils when viewed under the electron microscope. Stedman 25 [ 1913 Webster + AS ]

Amyloid degeneration (Med.), Same as amyloidosis; -- called also waxy degeneration or lardaceous degeneration. [ 1913 Webster + AS ]

n. (Med.) A disorder characterized by deposit of extracellular amyloid{ 2 } in organs or tissues in an amount that interferes with normal function of the affected organ; it is often secondary to chronic rheumatoid arthritis or tuberculosis or multiple myeloma. Called also amyloid degeneration waxy degeneration and lardaceous degeneration. [ WordNet 1.5 + AS ]

n. [ F. annelé ringed + -oid. ] (Zool.) An animal resembling an annelid. [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Annuloida. [ 1913 Webster ]

‖n. pl. [ NL., fr. L. annulus ring + -oid. ] (Zool.) A division of the Articulata, including the annelids and allied groups; sometimes made to include also the helminths and echinoderms. [ Written also Annuloidea. ] [ 1913 Webster ]

a. [ Astragalus + -oid. ] (Anat.) Resembling the astragalus in form. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. bde`lla leech + -oid. ] (Zool.) The order of Annulata which includes the leeches. See Hirudinea. [ 1913 Webster ]

n. [ Beryl + -oid. ] (Crystallog.) A solid consisting of a double twelve-sided pyramid; -- so called because the planes of this form occur on crystals of beryl. [ 1913 Webster ]

adj. 1. of or pertaining to a bungalow; similar to a bungalow. [ WordNet 1.5 ]

2. having many bungalows. the bungaloid suburbs [ WordNet 1.5 ]

n. [ Cellulose + -oid. ] A substance composed essentially of gun cotton and camphor, and when pure resembling ivory in texture and color, but variously colored to imitate coral, tortoise shell, amber, malachite, etc. It is used in the manufacture of jewelry and many small articles, as combs, brushes, collars, and cuffs; -- originally called xylonite. [ 1913 Webster ]

a. [ Cephalo- + -oid. ] Shaped like the head. Craing. [ 1913 Webster ]

a. [ Gr. ko`lla glue + -oid. Cf. Collodion. ] Resembling glue or jelly; characterized by a jellylike appearance; gelatinous; as, colloid tumors. [ 1913 Webster ]

n. 1. (Physiol. Chem.) A substance (as albumin, gum, gelatin, etc.) which is of a gelatinous rather than a crystalline nature, and which diffuses itself through animal membranes or vegetable parchment more slowly than crystalloids do; -- opposed to crystalloid. [ 1913 Webster ]

2. (Med.) A gelatinous substance found in colloid degeneration and colloid cancer. [ 1913 Webster ]

Styptic colloid (Med.), a preparation of astringent and antiseptic substances with some colloid material, as collodion, for ready use. [ 1913 Webster ]

a. Pertaining to, or of the nature of, colloids. [ 1913 Webster ]

n. The state or quality of being colloidal. [ 1913 Webster ]

a. [ Condyle + -oid: cf. F. condyloïde. ] (Anat.) Shaped like or pertaining to a condyle. [ 1913 Webster ]

a. [ L. corallum coral + -oid: cf. F. coralloïde. ] Having the form of coral; branching like coral. [ 1913 Webster ]

a. resembling coral; coralloid. Sir T. browne. [ 1913 Webster ]

a. [ Cotyle + -oid ] (Anat.) (a) Shaped like a cup; cup-shaped; as, the cotyloid cavity, the cup-shaped socket which receives the head of the thigh bone. (b) Pertaining to a cotyloid cavity; as, the cotyloid ligament, or notch.
Syn. -- acetabular, cotyloid. [ 1913 Webster + WordNet 1.5 ]

a. [ Gr. kry`stallos crystal + -oid. ] Crystal-like; transparent like crystal. [ 1913 Webster ]

n. 1. (Chem.) A body which, in solution, diffuses readily through animal membranes, and generally is capable of being crystallized; -- opposed to colloid. [ 1913 Webster ]

2. (Bot.) One of the microscopic particles resembling crystals, consisting of protein matter, which occur in certain plant cells; -- called also protein crystal. [ 1913 Webster ]

a. [ L.cuculus a cuckoo + -oid. ] (Zool.) Like or belonging to the cuckoos (Cuculidæ). [ 1913 Webster ]

a. [ NL. cyathophyllum, fr. Gr. ky`aqos a cup + fy`llon a leaf. ] (Paleon.) Like, or pertaining to, the family Cyathophyllidæ. [ 1913 Webster ]

n. (Paleon.) A fossil coral of the family Cyathophyllidæ; sometimes extended to fossil corals of other related families belonging to the group Rugosa; -- also called cup corals. Thay are found in paleozoic rocks. [ 1913 Webster ]

n. [ Cyclo- + -oid: cf. F. cycloïde. ] (Geom.) A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane. [ 1913 Webster ]

☞ The common cycloid is the curve described when the generating point (p) is on the circumference of the generating circle; the curtate cycloid, when that point lies without the circumference; the prolate or inflected cycloid, when the generating point (p) lies within that circumference. [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Cycloidei. [ 1913 Webster ]

Cycloid scale (Zool.), a fish scale which is thin and shows concentric lines of growth, without serrations on the margin. [ 1913 Webster ]

n. (Zool.) One of the Cycloidei. [ 1913 Webster ]

a. Pertaining to, or resembling, a cycloid; as, the cycloidal space is the space contained between a cycloid and its base. [ 1913 Webster ]

Cycloidal engine. See Geometric lathe. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. ky`klos circle + -oid. ] (Zool.) An order of fishes, formerly proposed by Agassiz, for those with thin, smooth scales, destitute of marginal spines, as the herring and salmon. The group is now regarded as artificial. [ 1913 Webster ]

a. & n. (Zool.) Same as 2d and 3d Cycloid. [ 1913 Webster ]

n. [ Gr. diplo`os twofold + -oid. ] 1. (Crystallog.) A solid bounded by twenty-four similar quadrilateral faces. It is a hemihedral form of the hexoctahedron. [ 1913 Webster ]

2. (Biol.) a cell or organism having a number of chromosomes corresponding to two copies of each chromosome; a diploid cell or organism. [ PJC ]

A: I'm not interested in diploids.
B: Oh, how I wish your parents had felt the same way!

a. [ Gr. diplo`os twofold + -oid. ] (Biol.) having a number of chromosomes corresponding to two copies of each chromosome; having double the basic number of chromosomes, as seen in a haploid cell. Contrasted to haploid and polyploid. in diploid cells, although the number of chromosomes is double that in haploid cells, it is not always true that there are two copies of every chromosome, since the two sex chromosomes in males will differ from each other. In females, and for other chromosomes, however, there are generally two copies of each, giving rise to the classical hereditary and sorting patterns of Mendelian genetics. [ PJC ]

n. An encephaloid cancer. [ 1913 Webster ]

a. [ Gr. 'egke`falos + -oid. ] Resembling the material of the brain; cerebriform. [ 1913 Webster ]

Encephaloid cancer (Med.), a very malignant form of cancer of brainlike consistency. See under Cancer. [ 1913 Webster ]

a. [ Endothelium + -oid. ] (Anat.) Like endothelium. [ 1913 Webster ]

n. [ Epicycle + -oid: cf. F. épicycloïde. ] (Geom.) A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle. [ 1913 Webster ]

☞ Any point rigidly connected with the rolling circle, but not in its circumference, traces a curve called an epitrochoid. The curve traced by a point in the circumference of the rolling circle when it rolls on the concave side of a fixed circle is called a hypocycloid; the curve traced by a point rigidly connected with the rolling circle in this case, but not its circumference, is called a hypotrochoid. All the curves mentioned above belong to the class class called roulettes or trochoids. See Trochoid. [ 1913 Webster ]

a. Pertaining to the epicycloid, or having its properties. [ 1913 Webster ]

Epicycloidal wheel, a device for producing straight-line motion from circular motion, on the principle that a pin fastened in the periphery of a gear wheel will describe a straight line when the wheel rolls around inside a fixed internal gear of twice its diameter. [ 1913 Webster ]

a. (Anat.) Epithelioid. [ 1913 Webster ]

n. [ L., fr. Gr. 'erysi`pelas; 'eryqro`s red + pe`lla hide, skin. See Red, and Pell, n. ] (Med.) a usually self-limiting cellulitis of the hand somewhat resembling erysipelas, caused by the bacterium Erysipelothrix rhusiopathiae. It may start at the site of a wound obtained while handling meat or fish, and may occasionally become generalizd with protracted illness and severe toxemia. Stedman [ PJC ]

a. [ Gr. "a`ls, "alo`s salt + -oid: cf. F. haloïde. ] (Chem.) Resembling salt; -- said of certain binary compounds consisting of a metal united to a negative element or radical, and now chiefly applied to the chlorides, bromides, iodides, and sometimes also to the fluorides and cyanides. -- n. A haloid substance. [ 1913 Webster ]

a. [ NL., fr. Gr. "aplo`os simple.] (Biol.) having half the number of chromosomes normally present in somatic cells; having only one chromosome of each type, and therefore having only one complete set of genes; Contrasted with diploid and polyploid. See also diploid. The germ cells of animals, the ovum and sperm cells, are haploid, whereas the somatic cells are diploid. Haploid variants of somatic cells may also be generated under certain conditions in the laboratory. [PJC]

{ } a. [ Gr. "omalo`s even + -oid.] (Geom.) Flat; even; -- a term applied to surfaces and to spaces, whether real or imagined, in which the definitions, axioms, and postulates of Euclid respecting parallel straight lines are assumed to hold true. [1913 Webster]

a. [ Gr. &unr_; glassy, transparent; "y`alos glass + &unr_; appearance: cf. F. hyaloïde.] (Anat.) Resembling glass; vitriform; transparent; hyaline; as, the hyaloid membrane, a very delicate membrane inclosing the vitreous humor of the eye. [1913 Webster]

a. [ Hydrencephalus + -oid. ] (Med.) Same as Hydrocephaloid. [ 1913 Webster ]

a. [ Hydrocephalus + -oid. ] (Med.) Resembling hydrocephalus. [ 1913 Webster ]

Hydrocephaloid affection (Med.), the group of symptoms which follow exhausting diarrhea in young children, resembling those of acute hydrocephalus, or tubercular meningitis. [ 1913 Webster ]