prop. n. A genus of tropical trees having papery leaves and large fruit.
Syn. -- genus Achras [ WordNet 1.5 ]

a. [ Gr. 'achrw`matos colorless; 'a priv. + chrw^ma, chrw`matos, color: cf. F. achromatique. ] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [ 1913 Webster ]

2. (Biol.) Uncolored; not absorbing color from a fluid; -- said of tissue. [ 1913 Webster ]

Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. --
Achromatic prism. See Prism. --
Achromatic telescope, or
microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color. [ 1913 Webster ]

adv. In an achromatic manner. [ 1913 Webster ]

n. Achromatism. [ 1913 Webster ]

n. (Biol.) Tissue which is not stained by fluid dyes. W. Flemming. [ 1913 Webster ]

adj. 1. not readily colored by stains; -- of substance of a cell nucleus chromatinic [ WordNet 1.5 ]

v. 1. remove color from.
Syn. -- achromatize, make achromatic [ WordNet 1.5 ]

n. [ Cf. F. achromatisme. ] The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Nichol. [ 1913 Webster ]

n. [ Cf. F. achromatisation. ] The act or process of achromatizing. [ 1913 Webster ]

v. t. [ imp. & p. p. Achromatized p. pr. & vb. n. Achromatizing ] [ Gr. 'a priv. + &unr_; color. ] To deprive of color; to make achromatic. [ Also spelled achromatise. ] [ 1913 Webster ]

n. [ Gr. 'a priv. + &unr_; color + &unr_; sight. ] Color blindness; inability to distinguish colors; Daltonism. [ 1913 Webster ]

a. [ See Ahromatic. ] Lacking, or deficient in, color; as, achromatous blood. [ Webster 1913 Suppl. ]

a. [ Gr. &unr_; colorless; &unr_; priv. + &unr_; color. ] Free from color; colorless; as, in (Physiol. Chem.), the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine. [ Webster 1913 Suppl. ]

a. See Acronyc. [ 1913 Webster ]

n. [ Gr. &unr_; colorless + E. dextrin. ] (Physiol. Chem.) Dextrin not colorable by iodine. See Dextrin. [ 1913 Webster ]

a. [ Gr. &unr_;; 'a priv. + &unr_; color. ] Colorless; achromatic. [ 1913 Webster ]

n. [ Gr. &unr_; undistinguishable; 'a priv. + &unr_; to separate, distinguish + &unr_; color. ] Color blindness; achromatopsy. [ 1913 Webster ]

n. [ Gr. &unr_; clear + &unr_; to observe. ] An instrument consisting in part of a differential thermometer. It is used for measuring changes of temperature produced by different conditions of the sky, as when clear or clouded. [ 1913 Webster ]

‖n. [ Per. ] The Evil Principle or Being of the ancient Persians; the Prince of Darkness as opposer to Ormuzd, the King of Light. [ 1913 Webster ]

a. Changeable in color. [ 1913 Webster ]

n. (Min.) See Garnet. [ 1913 Webster ]

a. [ Gr. &unr_; changed in color, fr. &unr_; other + &unr_; color. ] Changing color. [ 1913 Webster ]

a. [ Pref. amphi- + arthrodial. ] Characterized by amphiarthrosis. [ 1913 Webster ]

n. [ NL., fr. Gr. 'amfi` + &unr_; a joining, &unr_; a joint. ] (Anat.) A form of articulation in which the bones are connected by intervening substance admitting slight motion; symphysis. [ 1913 Webster ]

a. [ Gr. 'amfi` + &unr_; color. ] (Chem.) Exhibiting or producing two colors, as substances which in the color test may change red litmus to blue and blue litmus to red. [ 1913 Webster ]

/mhw> a. Characterized by, or involving, anachronism; anachronistic. [ 1913 Webster ]

n. [ Gr. 'anachronismo`s, fr. 'anachroni`zein to refer to a wrong time, to confound times; 'ana` + chro`nos time: cf. F. anachronisme. ] A misplacing or error in the order of time; an error in chronology by which events are misplaced in regard to each other, esp. one by which an event is placed too early; falsification of chronological relation. [ 1913 Webster ]

a. Erroneous in date; containing an anachronism. T. Warton. [ 1913 Webster ]

v. t. [ Gr. &unr_;. ] To refer to, or put into, a wrong time. [ R. ] Lowell. [ 1913 Webster ]

a. Containing an anachronism; anachronistic. -- An*ach"ro*nous*ly, adv. [1913 Webster]

‖n. [ NL., fr. Gr. 'an priv. + 'afrodi`sia sexual pleasure, 'Afrodi`th the goddess of love. ] (Med.) Absence of sexual appetite. AS [ 1913 Webster ]

a. & n. [ Gr. 'an priv. + 'afrodisiako`s pertaining to venery. ] (Med.) Same as Antaphrodisiac. Dunglison. AS [ 1913 Webster ]

‖ a. [ Pref. anti- + aphrodisiac. ] (Med.) Capable of blunting the sexual appetite. -- n. Anything that reduces the sexual appetite. [ 1913 Webster + AS ]

a. [ Gr. 'anafro`dito`s without love. ] (Biol.) Produced without concourse of sexes. [ 1913 Webster ]

‖n. pl. [ NL., from Gr. &unr_; without joints + -poda. See Anarthrous. ] (Zool.) One of the divisions of Articulata in which there are no jointed legs, as the annelids; -- opposed to Arthropoda. [ 1913 Webster ]

a. (Zool.) Having no jointed legs; pertaining to Anarthropoda. [ 1913 Webster ]

a. [ Gr. 'a`narqros without joints, without the article; 'an priv. + 'a`rqron joint, the article. ] 1. (Gr. Gram.) Used without the article; as, an anarthrous substantive. [ 1913 Webster ]

2. (Zool.) Without joints, or having the joints indistinct, as some insects. [ 1913 Webster ]

n. An antaphroditic medicine. [ 1913 Webster ]

a. [ Pref. anti- + Gr. 'Afrodi`th Aphrodite: cf. F. antaphroditique. ] (Med.) 1. Antaphrodisiac. AS [ 1913 Webster ]

2. Antisyphilitic. [ R. ] AS [ 1913 Webster ]

a. [ Pref. anti- + arthritic. ] (Med.) Alleviating arthritis. -- n. A remedy for alleviating arthritis. AS [ 1913 Webster ]

n. [ Gr. 'a`nqrax coal. ] (Chem.) A solid hydrocarbon, C6H4.C2H2.C6H4, which accompanies naphthalene in the last stages of the distillation of coal tar. Its chief use is in the artificial production of alizarin. [ Written also anthracin. ] [ 1913 Webster ]

A heavy green oil (partially solidifying on cooling), which distills over from coal tar at a temperature above 270°. It is the principal source of anthracene. [ Webster 1913 Suppl. ]

a. Of or relating to anthrax; as, anthracic blood. [ 1913 Webster ]

a. [ Gr. 'a`nqrax coal + -ferous. ] (Min.) Yielding anthracite; as, anthraciferous strata. [ 1913 Webster ]

n. [ L. anthracites a kind of bloodstone; fr. Gr. &unr_; like coals, fr. 'a`nqrax, &unr_;, coal or charcoal. Cf. Anthrax. ] A hard, compact variety of mineral coal, of high luster, differing from bituminous coal in containing little or no bitumen, in consequence of which it burns with a nearly non luminous flame. The purer specimens consist almost wholly of carbon. Also called glance coal and blind coal. [ 1913 Webster ]

a. Of, pertaining to, or like, anthracite; as, anthracitic formations. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, carbuncle + &unr_; disease. ] (Bot.) Any one of several fungus diseases, caused by parasitic species of the series Melanconiales, attacking the bean, grape, melon, cotton, and other plants. In the case of the grape, brown concave spots are formed on the stem and fruit, and the disease is called bird's-eye rot. [ Webster 1913 Suppl. ]

a. [ Anthrax + -oid. ] (Biol.) Resembling anthrax in action; of the nature of anthrax; as, an anthracoid microbe. [ 1913 Webster ]

n. [ Gr. 'a`nqrax, 'a`nqrakos, coal + -mancy. ] Divination by inspecting a burning coal. [ 1913 Webster ]

n. [ Gr. 'a`nqrax coal, carbon + -meter. ] An instrument for measuring the amount of carbonic acid in a mixture. [ 1913 Webster ]