Thermal conductivity, Thermal spectrum. See under Conductivity, and Spectrum.Thermal unit(Physics), a unit chosen for the comparison or calculation of quantities of heat. The unit most commonly employed is the amount of heat necessary to raise the temperature of one gram or one pound of water from zero to one degree Centigrade. See Calorie, and under Unit.

(Ther"mal*ly), adv. In a thermal manner.

(Ther*met"o*graph) n. [Gr. heat + measure + -graph.] A self-registering thermometer, especially one that registers the maximum and minimum during long periods. Nichol.

(Ther"mic) a. Of or pertaining to heat; due to heat; thermal; as, thermic lines.

Thermic balance. See Bolometer.Thermic fever(Med.), the condition of fever produced by sunstroke. See Sunstroke.Thermic weight. (Mech.) Same as Heat weight, under Heat.

(||Ther`mi`dor") n. [F., fr. Gr. warm, hot.] The eleventh month of the French republican calendar, — commencing July 19, and ending August 17. See the Note under Vendémiaire.

(Ther*mif"u*gine) n. [Gr. heat + L. fugere to flee.] (Chem.) An artificial alkaloid of complex composition, resembling thalline and used as an antipyretic, — whence its name.

(The"ri*ac ||The*ri"a*ca) n. [L. theriaca an antidote against the bite of serpents, Gr. : cf. F. thériaque. See Treacle.]

1. (Old Med.) An ancient composition esteemed efficacious against the effects of poison; especially, a certain compound of sixty-four drugs, prepared, pulverized, and reduced by means of honey to an electuary; — called also theriaca Andromachi, and Venice treacle.

2. Treacle; molasses. British Pharm.

(The"ri*ac The*ri"a*cal) a. [Cf. F. thériacal.] Of or pertaining to theriac; medicinal. "Theriacal herbs." Bacon.

(The"ri*al) a. Theriac. [R.] Holland.

(The"ri*o*dont) n. (Paleon.) One of the Theriodontia. Used also adjectively.

(||The`ri*o*don"ta) n. pl. [NL.] (Paleon.) Same as Theriodontia.

(||The`ri*o*don"ti*a) n. pl. [NL., fr. Gr. (dim. of a beast) + a tooth.] (Paleon.) An extinct order of reptiles found in the Permian and Triassic formations in South Africa. In some respects they resembled carnivorous mammals. Called also Theromorpha.

They had biconcave vertebræ, ambulatory limbs, and a well- developed pelvis and shoulder girdle. Some of the species had large maxillary teeth. The head somewhat resembled that of a turtle. The Dicynodont is one of the best-known examples. See Dicynodont.

(The`ri*ot"o*my) n. [Gr. wild beast + to cut.] Zoötomy.

(||Ther"mæ) n. pl. [L. See Thermal.] Springs or baths of warm or hot water.

(Ther"mal) a. [L. thermae hot springs, fr. Gr. pl. of heat, fr. hot, warm, to warm, make hot; perhaps akin to L. formus warm, and E. forceps.] Of or pertaining to heat; warm; hot; as, the thermal unit; thermal waters.

The thermal condition of the earth.
J. D. Forbes.

  By PanEris using Melati.

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