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A combination of three vowel sounds in a single syllable, forming a simple or compound sound; also, a union of three vowel characters, representing together a single sound; a trigraph; as, eye, -ieu in adieu, -eau in beau, are examples of triphthongs.

own, the crown, or tiara, of the pope. See Tiara, 2. -- Triple-expansion steam engine, a compound steam engine in which the same steam performs work in three cylinders successively. -- Triple measure (Mus.), a measure of tree beats of which first only is accented. -- Triple ratio (Math.), a ratio which is equal to 3…

of, small tubes; specifically (Bot.), composed wholly of tubulous florets; as, a tubulous compound flower. Tubulous boiler, a steam boiler composed chiefly of tubes containing water and surrounded by flame and hot gases; -- sometimes distinguished from tubular boiler.

A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.

flower stalks radiate from a common point, as in the carrot and milkweed. It is simple or compound; in the latter case, each peduncle bears another little umbel, called umbellet, or umbellule.

etimes particles and participial adjectives formed with this prefix coincide in form with compounds of the negative prefix un- (see 2d Un-); as in undone (from undo), meaning unfastened, ruined; and undone (from 2d un- and done) meaning not done, not finished. Un- is sometimes used with an intensive force merely; as in…

ded; united. Unitary theory (Chem.), the modern theory that the molecules of all complete compounds are units, whose parts are bound together in definite structure, with mutual and reciprocal influence on each other, and are not mere aggregations of more or less complex groups; -- distinguished from the dualistic theor…

Universal umbel (Bot.), a primary or general umbel; the first or largest set of rays in a compound umbel; -- opposed to partial umbel. A universal involucre is not unfrequently placed at the foot of a universal umbel.

Capable of taking up, or of uniting with, certain other elements or compounds, without the elimination of any side product; thus, aldehyde, ethylene, and ammonia are unsaturated.

Pertaining to, resembling, or containing uranium; specifically, designating those compounds in which uranium has a valence relatively higher than in uranous compounds.

A combining form (also used adjectively) from uranium; -- used in naming certain complex compounds; as in uranoso-uranic oxide, uranoso-uranic sulphate.

Pertaining to, or containing, uranium; designating those compounds in which uranium has a lower valence as contrasted with the uranic compounds.

The radical UO2, conveniently regarded as a residue of many uranium compounds.

A compound distilled spirit made in Ireland and Scotland; whisky. The Scottish returns being vested in grouse, white hares, pickled salmon, and usquebaugh. Sir W. Scott.

of unsaturation in the third degree. It is the only known member of a distinct series of compounds. It has a garlic odor.

ing to, or obtained from, vanadium; containing vanadium; specifically distinguished those compounds in which vanadium has a relatively higher valence as contrasted with the vanadious compounds; as, vanadic oxide. Vanadic acid (Chem.), an acid analogous to phosphoric acid, not known in the free state but forming a well-…

Pertaining to, or containing, vanadium; specifically, designating those compounds in which vanadium has a lower valence as contrasted with the vanadic compounds; as, vanadious acid. [Sometimes written also vanadous.]

A yellow pigment consisting of a compound of vanadium.

The hypothetical radical VO, regarded as a characterized residue of certain vanadium compounds.

Any one of numerous species of club-shaped, compound Alcyonaria belonging to Veretillum and allied genera, of the tribe Pennatulacea. The whole colony can move about as if it were a simple animal.