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ite metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.

ition of any performances before an assembly, as public lectures, scholastic exercises, anatomical demonstrations, surgical operations, etc.

or moral; as, Lavoisier's theory of combustion; Adam Smith's theory of moral sentiments. Atomic theory, Binary theory, etc. See under Atomic, Binary, etc.

der which burns in the air and forms thoria; -- formerly called also thorinum. Symbol Th. Atomic weight 232.0.

A combining form used in anatomy to indicate connection with, or relation to, the thyroid body or the thyroid cartilage; as, thyrohyal.

A combining form used in anatomy to indicate connection with, or relation to, the tibia; as, tibiotarsus, tibiofibular.

other alloys. Its compounds are designated as stannous, or stannic. Symbol Sn (Stannum). Atomic weight 117.4.

y amorphous powder, having a metallic luster. It burns when heated in the air. Symbol Ti. Atomic weight 48.1.

insects which live upon, and suck the sap of, trees and shrubs. They belong to Arma, Pentatoma, Rhaphigaster, and allied genera. -- Tree cat (Zool.), the common paradoxure (Paradoxurus musang). -- Tree clover (Bot.), a tall kind of melilot (Melilotus alba). See Melilot. -- Tree crab (Zoöl.), the purse crab. See und…

neutralizing three molecules of a monobasic acid or the equivalent; having three hydrogen atoms which may be acid radicals; -- said of certain bases; thus, glycerin is a triacid base.

eutralizing three molecules of a monacid base, or their equivalent; having three hydrogen atoms capable of replacement by basic elements on radicals; -- said of certain acids; thus, citric acid is a tribasic acid.

A chloride having three atoms of chlorine in the molecule.

Containing three atoms of chromium.

A glyceride formed by the replacement of three hydrogen atoms in glycerin by acid radicals.

H48, of the methane series, resembling paraffin; -- so called because it has twenty-three atoms of carbon in the molecule.

An oxide containing three atoms of oxygen; as, sulphur trioxide, SO3; -- formerly called tritoxide.

atio which is equal to 3. -- Triple salt (Chem.), a salt containing three distinct basic atoms as radicals; thus, microcosmic salt is a triple salt. -- Triple star (Astron.), a system of three stars in close proximity. -- Triple time (Mus.), that time in which each measure is divided into three equal parts. -- Trip…

ed in polishing stones and metals. It consists almost wholly of the siliceous shells of diatoms.

A sulphide containing three atoms of sulphur.

alence of three; capable of being combined with, substituted for, or compared with, three atoms of hydrogen; -- said of triad atoms or radicals; thus, nitrogen is trivalent in ammonia.