*trog*

n. [ Astro- + Gr. &unr_; birth. ] The creation or evolution of the stars or the heavens. H. Spencer. [ 1913 Webster ]

n. [ Astro- + Gr. &unr_; knowledge. ] The science or knowledge of the stars, esp. the fixed stars. Bouvier. [ 1913 Webster ]

n. Same as Astrogeny. -- As`*tro*gon"ic a. [1913 Webster]

n. [ Astro'cf + -graphy. ] The art of describing or delineating the stars; a description or mapping of the heavens. [ 1913 Webster ]

n. [ Gr. ba`ros weight + me`tron measure + -graph. ] A form of barometer so constructed as to inscribe of itself upon paper a record of the variations of atmospheric pressure. [ 1913 Webster ]

a. (Physics & Chem.) See Dextrogyrate. [ 1913 Webster ]

n. [ Dextro- + glucose. ] (Chem.) Same as Dextrose. [ 1913 Webster ]

a. [ Dextro- + gyrate. ] (Chem. & Opt.) Same as Dextrorotatory. [ 1913 Webster ]

n. [ Electro- + genesis. ] (Physiol.) Same as Electrogeny. [ 1913 Webster ]

a. (Physiol.) Of or pertaining to electrogenesis; as, an electrogenic condition. [ 1913 Webster ]

n. [ Electro- + Gr. &unr_; to produce. ] (Physiol.) A term sometimes applied to the effects (tetanus) produced in the muscles of the limbs, when a current of electricity is passed along the spinal cord or nerves. [ 1913 Webster ]

n. [ Electro- + -graph. ] 1. A mark, record, or tracing, made by the action of electricity. [ 1913 Webster ]

2. An apparatus, controlled by electric devices, used to trace designs for etching. [ Webster 1913 Suppl. ]

3. An instrument for the reproduction at a distance of pictures, maps, etc., by means of electricity. [ archaic ] [ Webster 1913 Suppl. ]

4. An image made by the Röntgen rays; a sciagraph. [ archaic ] [ Webster 1913 Suppl. ]

5. A cinematograph using the arc light. [ archaic ] [ Webster 1913 Suppl. ]

a. Of or pertaining to an electrograph or electrography. [ Webster 1913 Suppl. ]

n. 1. The art or process of making electrographs or using an electrograph. [ Webster 1913 Suppl. ]

2. = Galvanography. [ Webster 1913 Suppl. ]

n. any substance (like thiouracil or thiourea) that induces the formation of a goiter. [ WordNet 1.5 ]

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. [ L. introgressus, p. p. of introgredi to go in; intro- within + gradi to step, go. ] The act of going in; entrance. Blount. [ 1913 Webster ]

n. [ Gr. &unr_; measure + -graph. ] An instrument attached to a locomotive for recording its speed and the number and duration of its stops. [ 1913 Webster ]

n. [ Nitro- + gelatin. ] An explosive consisting of gun cotton and camphor dissolved in nitroglycerin. [ Written also nitrogelatine. ] [ 1913 Webster ]

n. [ L. nitrum natron + -gen: cf. F. nitrogène. See Niter. ] (Chem.) A colorless nonmetallic element of atomic number 7, tasteless and odorless, comprising four fifths of the atmosphere by volume in the form of molecular nitrogen (N2). It is chemically very inert in the free state, and as such is incapable of supporting life (hence the name azote still used by French chemists); but it forms many important compounds, such as ammonia, nitric acid, the cyanides, etc, and is a constituent of all organized living tissues, animal or vegetable. Symbol N. Atomic weight 14.007. It was formerly regarded as a permanent noncondensible gas, but was liquefied in 1877 by Cailletet of Paris, and Pictet of Geneva, and boils at -195.8 ° C at atmospheric pressure. Liquid nitrogen is used as a refrigerant to store delicate materials, such as bacteria, cells, and other biological materials. [ 1913 Webster +PJC ]

v. t. [ imp. & p. p. Nitrogenized p. pr. & vb. n. Nitrogenizing. ] (Chem.) To combine, or impregnate, with nitrogen or its compounds. [ 1913 Webster ]

a. (Chem.) Of, pertaining to, or resembling, nitrogen; as, a nitrogenous principle; nitrogenous compounds. [ 1913 Webster ]

Nitrogenous foods. See 2d Note under Food, n., 1. [ 1913 Webster ]

n. [ Nitro- + glycerin. ] (Chem.) A liquid appearing like a heavy oil, colorless or yellowish, and consisting of a mixture of several glycerin salts of nitric acid, and hence more properly called glycerin nitrate; also called trinitroglycerin and glyceryl trinitrate. It is made by the action of nitric acid on glycerin in the presence of sulphuric acid. It is extremely unstable and terribly explosive. A very dilute solution is used in medicine as a neurotic under the name of glonion. [ Written also nitroglycerine. ] [ 1913 Webster ]

☞ A great number of explosive compounds have been produced by mixing nitroglycerin with different substances; as, dynamite, or giant powder, nitroglycerin mixed with siliceous earth; lithofracteur, nitroglycerin with gunpowder, or with sawdust and nitrate of sodium or barium; Colonia powder, gunpowder with nitroglycerin; dualin, nitroglycerin with sawdust, or with sawdust and nitrate of potassium and some other substances; lignose, wood fiber and nitroglycerin. [ 1913 Webster ]

a. Devoid of nitrogen; as, a nonnitrogenous principle; a nonnitrogenous food. See the Note under Food, n., 1. [ 1913 Webster ]

prop. n. [ L. Ostrogothi, pl. See East, and Goth. ] One of the Eastern Goths. See Goth. [ 1913 Webster ]

prop. a. Of or pertaining to the Ostrogoths. [ 1913 Webster ]

n. [ NL., fr. Gr. pe`tra a rock + galh^ a weasel. ] (Zool.) Any Australian kangaroo of the genus Petrogale, as the rock wallaby (Petrogale penicillata). [ 1913 Webster ]

n. A carving or drawing on rock, especially one made by prehistoric humans; called also a petrograph. [ PJC ]

a. Of or pertaining to petroglyphs or petroglyphy. [ 1913 Webster ]

n. [ Petro + Gr. gly`fein to carve. ] The art or operation of carving figures or inscriptions on rock or stone. [ 1913 Webster ]

n. A carving or drawing on rock, especially one made by prehistoric humans; called also a petrograph. [ PJC ]

{ } a. Pertaining to petrography. [ 1913 Webster ]

n. [ Petro + -graphy. ] 1. The art of writing on stone. [ 1913 Webster ]

2. The scientific description of rocks; that department of science which investigates the constitution of rocks; petrology. [ 1913 Webster ]

n. [ See Photo-; Electrograph. ] (Meteor.) An electrometer registering by photography. [ Webster 1913 Suppl. ]

a. [ Pref. retro- + generative. ] Begetting young by retrocopulation. [ 1913 Webster ]

n. [ F. rétrogradation or L. retrogradatio. See Retrograde. ] 1. The act of retrograding, or moving backward. [ 1913 Webster ]

2. The state of being retrograde; decline. [ 1913 Webster ]

a. [ L. retrogradus, from retrogradi, retrogressus, to retrograde; retro back + gradi to step: cf. F. rétrograde. See Grade. ] 1. (Astron.) Apparently moving backward, and contrary to the succession of the signs, that is, from east to west, as a planet. Hutton. [ 1913 Webster ]

And if he be in the west side in that condition, then is he retrograde. Chaucer. [ 1913 Webster ]

2. Tending or moving backward; having a backward course; contrary; as, a retrograde motion; -- opposed to progressive. “Progressive and not retrograde.” Bacon. [ 1913 Webster ]

It is most retrograde to our desire. Shak. [ 1913 Webster ]

3. Declining from a better to a worse state; as, a retrograde people; retrograde ideas, morals, etc. Bacon. [ 1913 Webster ]

v. i. [ imp. & p. p. Retrograded p. pr. & vb. n. Retrograding. ] [ L. retrogradare, retrogradi: cf. F. rétrograder. ] 1. To go in a retrograde direction; to move, or appear to move, backward, as a planet. [ 1913 Webster ]

2. Hence, to decline from a better to a worse condition, as in morals or intelligence. [ 1913 Webster ]

adv. By retrograding; so as to retrograde. [ 1913 Webster ]

n. [ Cf. L. retrogressus. ] Retrogression. [ R. ] H. Spenser. [ 1913 Webster ]

n. [ Cf. F. rétrogression. See Retrograde, and cf. Digression. ] 1. The act of retrograding, or going backward; retrogradation. [ 1913 Webster ]

2. (Biol.) Backward development; a passing from a higher to a lower state of organization or structure, as when an animal, approaching maturity, becomes less highly organized than would be expected from its earlier stages or known relationship. Called also retrograde development, and regressive metamorphism. [ 1913 Webster ]

a. [ Cf. F. rétrogressif. ] 1. Tending to retrograde; going or moving backward; declining from a better to a worse state. [ 1913 Webster ]

2. (Biol.) Passing from a higher to a lower condition; declining from a more perfect state of organization; regressive. [ 1913 Webster ]

adv. In a retrogressive manner. [ 1913 Webster ]

n. [ Spectrum + -gram. ] (Physics) A photograph, map, or diagram of a spectrum. [ Webster 1913 Suppl. ]

n. [ Spectrum + graph. ] (Physics) (a) An apparatus for photographing or mapping a spectrum. (b) A photograph or picture of a spectrum. -- Spec`tro*graph"ic a. -- Spec`tro*graph"ic*al*ly adv. -- Spec*trog"ra*phy n. [Webster 1913 Suppl.]

n. [ Gr. th^le far + me`tron measure + -graph. ] A combination of the camera lucida and telescope for drawing and measuring distant objects. -- Tel`e*me*trog"ra*phy n. -- Tel`e*met`ro*graph"ic a. [ Webster 1913 Suppl. ]

n. [ Thermo- + Gr. &unr_; measure + -graph. ] (Physics) An instrument for recording graphically the variations of temperature, or the indications of a thermometer. [ 1913 Webster ]

n. [ L. troglodytae, pl., Gr. &unr_; one who creeps into holes; &unr_; a hole, cavern (fr. &unr_; to gnaw) + &unr_; enter: cf. F. troglodyte. ] 1. (Ethnol.) One of any savage race that dwells in caves, instead of constructing dwellings; a cave dweller, or cave man. Most of the primitive races of man were troglodytes. [ 1913 Webster ]

In the troglodytes' country there is a lake, for the hurtful water it beareth called the “mad lake.” Holland. [ 1913 Webster ]

2. (Zool.) An anthropoid ape, as the chimpanzee. [ 1913 Webster ]

3. (Zool.) The wren. [ 1913 Webster ]