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Triadic

Having the characteristics of a triad; as, boron is triadic.

Trial

The act of trying or testing in any manner.

Triality

Three united; state of being three.

Trialogue

A discourse or colloquy by three persons.

Triamide

An amide containing three amido groups.

Triamine

An amine containing three amido groups.

Triandria

A Linnaean class of plants having three distinct and equal stamens.

Triandrous Triandrian

Of or pertaining to the Triandria; having three distinct and equal stamens in the same flower.

Triangle

A figure bounded by three lines, and containing three angles.

Triangular

Having three angles; having the form of a triangle.

Triangulares

The triangular, or maioid, crabs. See Illust. under Maioid, and Illust. of Spider crab, under Spider.

Triangularly

In a triangular manner; in the form of a triangle.

Triangulate

To divide into triangles; specifically, to survey by means of a series of triangles properly laid down and measured.

Triangulation

The series or network of triangles into which the face of a country, or any portion of it, is divided in a trigonometrical survey; the operation of measuring the elements necessary to determine the triangles into which the country to be surveyed is supposed to be divided, and thus to fix the positions and distances of the several points connected by them.

Triarchy

Government by three persons; a triumvirate; also, a country under three rulers.

Triarian

Occupying the third post or rank.

Trias

The formation situated between the Permian and Lias, and so named by the Germans, because consisting of three series of strata, which are called in German the Bunter sandstein, Muschelkalk, and Keuper.

Triassic

Of the age of, or pertaining to, the Trias. The Triassic formation.

Triatic

A term used in the phrase triatic stay. See under Stay.

Triatomic

Having three atoms; -- said of certain elements or radicals. Having a valence of three; trivalent; sometimes, in a specific sense, having three hydroxyl groups, whether acid or basic; thus, glycerin, glyceric acid, and tartronic acid are each triatomic.

Tribal

Of or pertaining to a tribe or tribes; as, a tribal scepter.

Tribalism

The state of existing in tribes; also, tribal feeling; tribal prejudice or exclusiveness; tribal peculiarities or characteristics.

Tribasic

Capable of neutralizing 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.

Tribble

A frame on which paper is dried.

Tribe

To distribute into tribes or classes.

tribo-

a combining form relating to friction.

triboelectricity

electrical charge developed by rubbing objects together, suc as amber on cat fur.

tribology

the study of the effects of friction on parts of machinery moving in contact with each other, and of methods, such as lubrication, to counteract negative effects such as wear.

Tribometer

An instrument to ascertain the degree of friction in rubbing surfaces.

Tribrach

A poetic foot of three short syllables, as, m/l//s.

Tribromphenol Tribromophenol

A colorless crystalline substance (C6H3OBr3) prepared by the reaction of carbolic acid with bromine. The predominant isomer is 2,4,6-tribromophenol; -- called also bromol.

Tribular Tribual

Of or relating to a tribe; tribal; as, a tribual characteristic; tribular worship.

Tribulation

That which occasions distress, trouble, or vexation; severe affliction.

Tribunal

In villages of the Philippine Islands, a kind of townhall. At the tribunal the head men of the village met to transact business, prisoners were confined, and troops and travelers were often quartered.

Tribunary

Of or pertaining to tribunes; as, tribunary powers or authority.

Tribunate

The state or office of a tribune; tribuneship.

Tribune

An officer or magistrate chosen by the people, to protect them from the oppression of the patricians, or nobles, and to defend their liberties against any attempts that might be made upon them by the senate and consuls.

Tributary

A ruler or state that pays tribute, or a stated sum, to a conquering power, for the purpose of securing peace and protection, or as an acknowledgment of submission, or for the purchase of security.

Tributer

One who works for a certain portion of the ore, or its value.

Trica

An apothecium in certain lichens, having a spherical surface marked with spiral or concentric ridges and furrows.

Tricarballylic

Of, pertaining to, or designating, a complex tribasic organic acid, C3H5.(CO2H)3 occurring naturally in unripe beet roots, and produced artificially from glycerin as a white crystalline substance.

Trice

A very short time; an instant; a moment; -- now used only in the phrase in a trice.

Tricennial

Of or pertaining to thirty years; consisting of thirty years; occurring once in every thirty years.

Tricentenary

Including, or relating to, the interval of three hundred years; tercentenary. A period of three centuries, or three hundred years, also, the three-hundredth anniversary of any event; a tercentenary.

Triceps

A muscle having three heads; specif., the great extensor of the forearm, arising by three heads and inserted into the olecranon at the elbow.

Trichiasis

A disease of the eye, in which the eyelashes, being turned in upon the eyeball, produce constant irritation by the motion of the lids.

Trichina

A small, slender nematoid worm (Trichina spiralis) which, in the larval state, is parasitic, often in immense numbers, in the voluntary muscles of man, the hog, and many other animals. When insufficiently cooked meat containing the larvae is swallowed by man, they are liberated and rapidly become adult, pair, and the ovoviviparous females produce in a short time large numbers of young which find their way into the muscles, either directly, or indirectly by means of the blood. Their presence in the muscles and the intestines in large numbers produces trichinosis.

Trichinize

To render trichinous; to affect with trichinae; -- chiefly used in the past participle; as, trichinized pork.

Trichinoscope

An apparatus for the detection of trichinae in the flesh of animals, as of swine.

Trichinosis

The disease produced by the presence of trichinae in the muscles and intestinal track. It is marked by fever, muscular pains, and symptoms resembling those of typhoid fever, and is frequently fatal.

Trichinous

Of or pertaining to trichinae or trichinosis; affected with, or containing, trichinae; as, trichinous meat.

Trichiuriform

Like or pertaining to the genus Trichiurus or family Trichiuridae, comprising the scabbard fishes and hairtails.

Trichiurus

A genus of fishes comprising the hairtails. See Hairtail.

Trichloride

A chloride having three atoms of chlorine in the molecule.

Trichobranchia

The gill of a crustacean in which the branchial filaments are slender and cylindrical, as in the crawfishes.

Trichogyne

The slender, hairlike cell which receives the fertilizing particles, or antherozoids, in red seaweeds.

Trichomanes

Any fern of the genus Trichomanes. The fronds are very delicate and often translucent, and the sporangia are borne on threadlike receptacles rising from the middle of cup-shaped marginal involucres. Several species are common in conservatories; two are native in the United States.

Trichomatose

Affected with a disease which causes agglutination and matting together; -- said of the hair when affected with plica. See Plica, 1.

Trichome

A hair on the surface of leaf or stem, or any modification of a hair, as a minute scale, or star, or gland. The sporangia of ferns are believed to be of the nature of trichomes.

Trichophore

The special cell in red algae which produces or bears a trichogyne. See Illust. of Trichogyne.

Trichoptera

A suborder of Neuroptera usually having the wings covered with minute hairs. It comprises the caddice flies, and is considered by some to be a distinct order.

Trichopterous

Of, pertaining to, or characterizing, the Trichoptera.

Trichord

An instrument, as a lyre or harp, having three strings.

Trichoscolices

An extensive group of wormlike animals characterized by being more or less covered with cilia.

Trichotomous

Divided into three parts, or into threes; three-forked; as, a trichotomous stem.

Trichroic

Exhibiting trichroism; pleochroic; pleochroism.

Trichroism

The quality possessed by some crystals of presenting different colors in three different directions.

Trichromatic

Having or existing in three different phases of color; having three distinct color varieties; -- said of certain birds and insects.

Trichromatism

The quality, state, or phenomenon of being trichromatic.

Tricipital

Having three heads, or three origins; as, a tricipital muscle.

Trick

To deceive by cunning or artifice; to impose on; to defraud; to cheat; as, to trick another in the sale of a horse.

Trickery

The art of dressing up; artifice; stratagem; fraud; imposture.

Trickish

Given to tricks; artful in making bargains; given to deception and cheating; knavish.

Trickle

The act or state of trickling; also, that which trickles; a small stream; drip.

Tricksiness

The quality or state of being tricksy; trickiness.

Trickster

One who tricks; a deceiver; a tricker; a cheat.

Tricksy

Exhibiting artfulness; trickish.

Tricky

Given to tricks; practicing deception; trickish; knavish.

Tricliniary

Of or pertaining to a triclinium, or to the ancient mode of reclining at table.

Triclinic

Having, or characterized by, three unequal axes intersecting at oblique angles. See the Note under crystallization.

Triclinium

A couch for reclining at meals, extending round three sides of a table, and usually in three parts. A dining room furnished with such a triple couch.

Tricoccous

Having three cocci, or roundish carpels.

Tricostate

Three-ribbed; having three ribs from the base.

Tricot

A fabric of woolen, silk, or cotton knitted, or women to resemble knitted work.

Tricrotic

Of or pertaining to tricrotism; characterized by tricrotism.

Tricrotism

That condition of the arterial pulse in which there is a triple beat. The pulse curve obtained in the sphygmographic tracing characteristic of tricrotism shows two secondary crests in addition to the primary.

Tricurvate

Curved in three directions; as, a tricurvate spicule (see Illust. of Spicule).

Tricuspid

Having three cusps, or points; tricuspidate; as, a tricuspid molar.

Tricuspidate

Three-pointed; ending in three points; as, a tricuspidate leaf.

Tricycle

A three-wheeled velocipede. See Illust. under Velocipede. Cf. Bicycle.

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