n. [ Aëro- + Gr. &unr_; a running. ] (Aëronautics) (a) A shed for housing an airship or aëroplane. (b) A ground or field, esp. one equipped with housing and other facilities, used for flying purposes. -- A`ër*o*drom"ic a. [Webster 1913 Suppl.]

n. 1. an airfield equipped with control tower and hangers as well as accommodations for passengers and cargo.
Syn. -- airport, aerodrome [ WordNet 1.5 ]

{ , n. } (Astron.) A meteor appearing to radiate from a point in the constellation Andromeda, -- whence the name. [ 1913 Webster ]

☞ A shower of these meteors takes place every year on November 27th or 28th. The Andromedes are also called Bielids, as they are connected with Biela's comet and move in its orbit. [ Webster 1913 Suppl. ]

n. [ L., fr. Gr. &unr_;, the daughter of Cepheus and Cassiopeia. When bound to a rock and exposed to a sea monster, she was delivered by Perseus. ] 1. (Astron.) A northern constellation, supposed to represent the mythical Andromeda. [ 1913 Webster ]

2. (bot.) A genus of ericaceous flowering plants of northern climates, of which the original species was found growing on a rock surrounded by water. [ 1913 Webster ]

n. [ Gr. kata`dromos race course; kata` down + dro`mos course. ] 1. A race course. [ 1913 Webster ]

2. (Mach.) A machine for raising or lowering heavy weights. [ 1913 Webster ]

n. [ Gr. &unr_; a grain (of wheat or spelt), cartilage + -meter. ] A steelyard for weighting grain. [ 1913 Webster ]

a. [ Gr. ky`lindros + me`tron measure. ] Belonging to a scale used in measuring cylinders. [ 1913 Webster ]

prop. n. a genus having only one species, the bush poppy.
Syn. -- genus Dendromecon. [ WordNet 1.5 ]

n. [ Gr. de`ndron tree + -meter: cf. F. dendromètre. ] An instrument to measure the height and diameter of trees. [ 1913 Webster ]

n. (Med.) A congenital disorder caused by an extra chromosome 21 in some or all cells. It causes a variable number and degree of abnormalities, including retarded growth, mental retardation, a short nose, prominent epicanthic folds on the eyelids, a protruding lower lip, and other physical features having varying degrees of deviation from the normal. Called also mongolism, trisomy-21 and trisomy 21 syndrome. [ PJC ]

n. Short for Aërodrome. [ Slang ]

n. [ F., fr. Gr. droma`s running. See Dromedary. ] (Zool.) The crab plover (Dromas ardeola), a peculiar North African bird, allied to the oyster catcher. [ 1913 Webster ]

n.; pl. Dromedaries [ F. dromadaire, LL. dromedarius, fr. L. dromas (sc. camelus), fr. Gr. droma`s running, from dramei^n, used as aor. of tre`chein to run; cf. Skr. dram to run. ] (Zool.) The Arabian camel (Camelus dromedarius), having one hump or protuberance on the back, in distinction from the Bactrian camel, which has two humps. [ 1913 Webster ]

☞ In Arabia and Egypt the name is restricted to the better breeds of this species of camel. See Deloul.

{ } n. Same as Hemadrometer. [ 1913 Webster ]

{ pr>(-dr&ouptack_;*m&obreve_;m"&euptack_;*tr&ybreve_;), } n. Same as Hemadrometry. [1913 Webster]

{ } n. [ Hema- + Gr. &unr_; course + -meter. ] (Physiol.) An instrument for measuring the velocity with which the blood moves in the arteries.

{ } n. (Physiol.) The act of measuring the velocity with which the blood circulates in the arteries; haemotachometry. [ 1913 Webster ]

n. [ L. hippodromos, Gr. &unr_;; "i`ppos horse + &unr_; course, fr. &unr_; to run: cf. F. hippodrome.] 1. (Gr. Antiq.) A place set apart for equestrian and chariot races. [1913 Webster]

2. An arena for equestrian performances; a circus. [1913 Webster]

3. (Sports) A fraudulent contest with a predetermined winner. [Slang, U. S.] [Webster 1913 Suppl.]

v. i. [ imp. & p. p. Hippodromed p. pr. & vb. n. Hippodroming. ] (Sports) To arrange contests with predetermined winners. [ Slang, U. S. ] [ Webster 1913 Suppl. ]

n. [ Hydro-, 1 + mechanics. ] That branch of physics which treats of the mechanics of liquids, or of their laws of equilibrium and of motion. [ 1913 Webster ]

‖n.; pl. Hydromedusæ [ NL. See Hydra, and Medusa. ] (Zool.) Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusæ. [ 1913 Webster ]

☞ Such medusæ are the reproductive zooids or gonophores, either male or female, of the hydroid from which they arise, whether they become free or remain attached to the hydroid colony. They in turn produce the eggs from which the hydroids are developed. The name is also applied to other similar medusæ which are not known to bud from a hydroid colony, and even to some which are known to develop directly from the eggs, but which in structure agree essentially with those produced from hydroids. See Hydroidea, and Gymnoblastea. [ 1913 Webster ]

n. [ L. hydromel, hydromeli, Gr. &unr_;; "y`dwr water + &unr_; honey: cf. F. hydromel.] A liquor consisting of honey diluted in water, and after fermentation called mead. [1913 Webster]

a. See Cyamellone. [ 1913 Webster ]

a. Of or pertaining to hydrometallurgy; involving the use of liquid reagents in the treatment or reduction of ores. -- Hy`dro*met`al*lur"gic*al*ly, adv. [1913 Webster]

n. [ Hydro-, 1 + metallurgy. ] The art or process of assaying or reducing ores by means of liquid reagents. [ 1913 Webster ]

n. [ Hydro-, 1 + meteor. ] A meteor or atmospheric phenomenon dependent upon the vapor of water; -- in the pl., a general term for the whole aqueous phenomena of the atmosphere, as rain, snow, hail, etc. Nichol. [ 1913 Webster ]

a. Of or pertaining to hydrometeorology, or to rain, clouds, storms, etc. [ 1913 Webster ]

n. [ Hydro-, 1 + meteorology. ] That branch of meteorology which relates to, or treats of, water in the atmosphere, or its phenomena, as rain, clouds, snow, hail, storms, etc. [ 1913 Webster ]

n. [ Hydro-, 1 + -meter: cf. F. hydromètre. ] 1. (Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc. [ 1913 Webster ]

☞ It is usually made of glass with a graduated stem, and indicates the specific gravity of a liquid by the depth to which it sinks in it, the zero of the scale marking the depth to which it sinks in pure water. Extra weights are sometimes used to adapt the scale to liquids of different densities. [ 1913 Webster ]

2. An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.

{ } a. [ Cf. F. hydromètrique. ] 1. Of or pertaining to an hydrometer, or to the determination of the specific gravity of fluids. [ 1913 Webster ]

2. Of or pertaining to measurement of the velocity, discharge, etc., of running water. [ 1913 Webster ]

3. Made by means of an hydrometer; as, hydrometric observations. [ 1913 Webster ]

Hydrometric pendulum, a species of hydrometer consisting of a hollow ball of ivory or metal suspended by a treated from the center of a graduated quadrant, and held in a stream to measure the velocity of the water by the inclination given to the thread; a kind of current gauge. [ 1913 Webster ]

n. [ Hydro-, 1 + Gr. &unr_; measure + -graph. ] An instrument for determining and recording the quantity of water discharged from a pipe, orifice, etc., in a given time. [ 1913 Webster ]

n. [ Cf. F. hydromètrique. ] 1. The art of determining the specific gravity of liquids, and thence the strength of spirituous liquors, saline solutions, etc. [ 1913 Webster ]

2. The art or operation of measuring the velocity or discharge of running water, as in rivers, etc. [ 1913 Webster ]

n. [ Iso- + Gr. &unr_; course. ] (Nav.) A method of moving a fleet from one formation to another, the direction usually being changed eight points (90°), by means of paths of equal length for each ship. It is prohibited in the United States navy. [ Webster 1913 Suppl. ]

n. [ Gr. &unr_;; &unr_;, &unr_;, torch + &unr_; course, race, fr. &unr_; to run. ] (Gr. Antiq.) A race run by young men with lighted torches in their hands. He who reached the goal first, with his torch unextinguished, gained the prize. [ 1913 Webster ]

n. [ Gr. pali`ndromos running back again; pa`lin again + dramei^n to run: cf. F. palindrome. ] A word, verse, or sentence, that is the same when read backward or forward; as, madam; Hannah; or Lewd did I live, & evil I did dwel. [ 1913 Webster ]

n. [ Gr. &unr_;, fr. &unr_; running around, fr. &unr_; to run round; peri` round + &unr_; to run: cf. F. péridrome. ] (Archæol.) The space between the columns and the wall of the cella, in a Greek or a Roman temple. [ 1913 Webster ]

n. [ Photo- + Gr. dramei^n to run. ] (Physics) An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction. [ 1913 Webster ]

n. [ Gr. &unr_; running before; &unr_; before + &unr_; to run: cf. F. prodrome. ] 1. A forerunner; a precursor. [ 1913 Webster ]

2. (Med.) A premonitory symptom; a symptom or sensation experienced by a person which presages the onset of a disease or abnormal physiological event; as, the prodrome of an epileptic seizure. [ PJC ]

‖n. [ NL., from Gr. &unr_;; sy`n with + &unr_; a course, a running. ] 1. Concurrence. [ R. ] Glanvill. [ 1913 Webster ]

2. (Med.) A group of symptoms occurring together that are characteristic and indicative of some underlying cause, such as a disease. [ 1913 Webster ]

3. generally, a pattern of characteristics or behaviors occurring together, that are sufficiently common and distinctive to indicate that they are due to a known cause. [ PJC ]

{ n., . [ After one Twaddell, its inventor. ] A form of hydrometer for liquids heavier than water, graduated with an arbitrary scale such that the readings when multiplied by .005 and added to unity give the specific gravity. [ Webster 1913 Suppl. ]