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Occurring once in every three hours.

Of or pertaining to a trimester, or period of three months; occurring once in every three months; quarterly.

Occurring or appearing three times a week; thriceweekly; as, a triweekly newspaper. -- adv.

t, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.

An unexplained word occurring in Chaucer, meaning, perhaps, an aromatic sweetmeat for sweetening the breath. T. R. Lounsbury. Under his tongue a truelove he bore. Chaucer. Truelove knot, a complicated, involved knot that does not readily untie; the emblem of interwoven affection or engagement; -- called also true-lover…

The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram.

up. (a) To bend, or be doubled, upward. (b) To appear; to come to light; to transpire; to occur; to happen.

a containing a little copper; calaite. It has a blue, or bluish green, color, and usually occurs in reniform masses with a botryoidal surface. [Formerly written also turcois, and turkois.]

A violent whirlwind; specifically, a violent whirlwind occurring in the Chinese seas.

A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.

A mineral occurring in white rounded crystalline masses. It is a hydrous borate of lime and soda.

Occurring once in every period of eleven years; undecennial. An undecennary account laid before Parliament. E. Stiles.

Occurring or observed every eleventh year; belonging to, or continuing, a period of eleven years; undecennary; as, an undecennial festival.

Done or occurring out of sight; secret. [Colloq.] Underground railroad or railway. See under Railroad.

Hence, something occurring or done in the afternoon; esp., an afternoon meal; supper; also, an afternoon nap; a siesta. [Obs. or Prov. Eng.] Another great supper, or undermeal, was made ready for them, coming home from ditching and plowing. Withals (1608). I think I am furnished with Cattern [Catharine] pears for one u…

Not seasonable; being, done, or occurring out of the proper season; ill-timed; untimely; too early or too late; as, he called at an unseasonable hour; unseasonable advice; unseasonable frosts; unseasonable food. -- Un*sea"son*a*ble*ness, n. -- Un*sea"son*a*bly, adv.

anite, porphyry, etc., and also to deposits of loose material, as the glacial till, which occur in masses without layers or strata.

The state of being up or above; a state of elevation, prosperity, or the like; -- rarely occurring except in the phrase ups and downs. [Colloq.] Ups and downs, alternate states of elevation and depression, or of prosperity and the contrary. [Colloq.] They had their ups and downs of fortune. Thackeray.…

A mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende.

Of or pertaining to the urethra. Urethral fever (Med.), fever occurring as a consequence of operations upon the urethra.