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THERE-UN'DER, adv. [comp. there and under.]

Under that or this. Ralegh.

THERE-UP-ON', comp. [there and upon.]

  1. Upon that or this. The remnant of the house of Judah, they shall feed thereupon. Zeph. ii.
  2. In consequence of that. He hopes to find you forward, / And thereupon he sends you this good news. Shak.
  3. Immediately.

THERE-WHILE, adv. [comp. there and while.]

At the same time. [Obs.] Wickliffe.

THERE-WITH', adv. [comp. there and with.]

With that or this. I have learned in whatever state I am, therewith to be content. Phil. iv.

THERE-WITH-AL', adv. [comp. there and withal.]

  1. Over and above.
  2. At the same time.
  3. With that. [This word is obsolete.] [The foregoing compounds of there with the prepositions, are for the most part deemed inelegant and obsolete. Some of them however are in good use, and particularly in the law style.]

THERF-BREAD, n. [therf'bred. Sax. thærf, theorf, unfermented.]

Unleavened bread. [Not in use.] Wickliffe.


Pertaining to theriac; medicinal. Bacon.

THE'RI-AC, n. [L. theriaca, Gr. θηριακη, treacle.]

A name given by the ancients to various compositions esteemed efficacious against the effects of poison, but afterward restrained chiefly to what has been called Theriaca Andromachi, or Venice treacle, which is a compound of sixty-four drugs, prepared, pulverized, and reduced by means of honey to an electuary. Cyc.

THER'MAL, a. [L. thermæ, warm baths; Gr. θερμαι, from θερω, to warm.]

Pertaining to heat; warm. Thermal waters, are warm or tepid mineral waters, whose heat varies from 92º to 112º. Parr.

THER'MI-DOR, n. [Gr. θερμος, warm.]

The name of the 11th month of the French republican year, commencing July 19, and ending August 17.

THER'MO-GEN, n. [Gr. θερμη, heat, and γενος, γενομαι, to generate.]

The elementary matter of heat; caloric. Good.

THER'MO-LAMP, n. [Gr. θερμος, warm, from θερμη, heat, and lamp.]

An instrument for furnishing light by means of inflammable gas. Med. Repos.

THER-MOM'E-TER, n. [Gr. θερμος, warm, from θερμη, heat, and μετρον, measure.]

An instrument for measuring heat; founded on the property which heat possesses of expanding all bodies, the rate or quantity of expansion being supposed proportional to the degree of heat applied, and hence indicating that degree. The thermometer indicates only the sensible heat of bodies, and gives us no information respecting the quantity of latent heat, or of combined heat, which those bodies may contain. D. Olmsted.


  1. Pertaining to a thermometer; as, the thermometrical scale or tube.
  2. Made by a thermometer; as, thermometrical observations.


By means of a thermometer.

THER'MO-SCOPE, n. [Gr. θερμη, heat, and σκοπεω, to see.]

An instrument showing the temperature of the air, or the degree of heat and cold. Arbuthnot.

THER'MO-STAT, n. [Gr. θερμος and ιστημι.]

A self-acting physical apparatus for regulating temperature, by the unequal expansion of metals by heat. Brande.

THER-MO-TEN'SION, n. [Gr. θερμος, hot, and L. tensio, a stretching.]

Literally, a stretching by heat. This word is applied by Professor Johnson, to a process of increasing the direct cohesion of wrought iron. It consists in heating the metal to a determinate temperature, generally from 500 to 600 degrees of Fahrenheit, and in that state, giving to it, by appropriate machinery, a mechanical strain or tension in the direction in which the strength is afterward to be exerted. The degree of tensile force applied is determined beforehand by trials on the same quality of metal at ordinary atmospheric temperature, to ascertain what force would, in that case, have been sufficient to break the piece which is to be submitted to thermotension. If this process should succeed, it may be of great use in giving strength to chain cables.

THESE, pron.

[plur. of This: pronounced theez, and used as an adjective or substitute. These is opposed to those, as this is to that, and when two persons or things or collections of things are named, these refers to the things or persons which are nearest in place or order, or which are last mentioned. Some place the bliss in action, some in case; / Those call it pleasure, and contentment these. Pope. Hence these is a substitute for these persons, and for the persons last mentioned, who place their bliss in ease.

THE'SIS, n. [L. thesis; Gr. θεσις, a position, from τιθημι, to set.]

  1. A position or proposition which a person advances and offers to maintain, or which is actually maintained by argument; a theme; a subject.
  2. In logic, every proposition may be divided into thesis and hypothesis. Thesis contains the thing affirmed or denied, and hypothesis the conditions of the affirmation or negation. Cyc.
  3. In music, the unaccented part of the measure, which the Greeks expressed by the downward beat.


A lawgiver.

THES'PI-AN, n. [From Thespis.]

A term applied to tragic acting.

THE'TA, n. [Gr. θ.]

The unlucky letter of the Greek alphabet, so called from being used by the judges in passing condemnation on a prisoner, it being the first letter of the Greek θανατος, death.

THET'IC-AL, a. [from Gr. θετικος. See Thesis.]

Laid down. More.

THE-UR'GIC, or THE-UR'GIC-AL, a. [from theurgy.]

Pertaining to the power of performing supernatural things. Theurgic hymns, songs of incantation.