triangle

• POS: Noun
• HYPHEN: tri=an=gle

CIDE DICTIONARY

triangle, n. [L. triangulum, fr. triangulus triangular; tri- (see Tri-) + angulus angle: cf. F. triangle. See Angle a corner.].

•  A figure bounded by three lines, and containing three angles.  [1913 Webster]

  " A triangle is either plane, spherical, or curvilinear, according as its sides are straight lines, or arcs of great circles of a sphere, or any curved lines whatever. A plane triangle is designated as scalene, isosceles, or equilateral, according as it has no two sides equal, two sides equal, or all sides equal; and also as right-angled, or oblique-angled, according as it has one right angle, or none; and oblique-angled triangle is either acute-angled, or obtuse-angled, according as all the angles are acute, or one of them obtuse. The terms scalene, isosceles, equilateral, right-angled, acute-angled, and obtuse-angled, are applied to spherical triangles in the same sense as to plane triangles."  [1913 Webster]
•  An instrument of percussion, usually made of a rod of steel, bent into the form of a triangle, open at one angle, and sounded by being struck with a small metallic rod.  [1913 Webster]
•  A draughtsman's square in the form of a right-angled triangle.  [1913 Webster]
•  A kind of frame formed of three poles stuck in the ground and united at the top, to which soldiers were bound when undergoing corporal punishment, -- now disused.  [1913 Webster]
•  A small constellation situated between Aries and Andromeda.  [1913 Webster]

Triangle spider (Zoöl.), a small American spider (Hyptiotes Americanus) of the family Ciniflonidæ, living among the dead branches of evergreen trees. It constructs a triangular web, or net, usually composed of four radii crossed by a double elastic fiber. The spider holds the thread at the apex of the web and stretches it tight, but lets go and springs the net when an insect comes in contact with it.

OXFORD DICTIONARY

triangle, n.
1 a plane figure with three sides and angles.
2 any three things not in a straight line, with imaginary lines joining them.
3 an implement of this shape.
4 a musical instrument consisting of a steel rod bent into a triangle and sounded by striking it with a small steel rod.
5 a situation, esp. an emotional relationship, involving three people.
6 a right-angled triangle of wood etc. as a drawing-implement.
7 Naut. a device of three spars for raising weights.
8 hist. a frame of three halberds joined at the top to which a soldier was bound for flogging.

Idiom

triangle of forces a triangle whose sides represent in magnitude and direction three forces in equilibrium.

Etymology

ME f. OF triangle or L triangulum neut. of triangulus three-cornered (as TRI-, ANGLE(1))

THESAURUS

triangle

Platonic body, T square, acute-angled triangle, adulterous affair, adultery, affair, amour, battery, bell, bells, bones, branks, castanets, celesta, chime, chimes, church bell, clapper, clappers, clover, cowbell, crank, crash cymbal, cube, cuboid, cucking stool, cuckoldry, cusp, cymbals, decagon, deuce-ace, dinner bell, dinner gong, dodecagon, dodecahedron, doorbell, ducking stool, entanglement, equilateral triangle, eternal triangle, finger cymbals, finger pillory, fire bell, flirtation, forbidden love, foursquare, gamelan, glockenspiel, gnomon, gong, gong bell, hand bell, handbells, hanky-panky, heptagon, hexagon, hexahedron, hypercube, icosahedron, idiophone, illicit love, infidelity, intrigue, isosceles triangle, jingle bell, leash, liaison, love affair, lyra, maraca, marimba, metallophone, oblong, obtuse-angled triangle, octagon, octahedron, orchestral bells, oxygon, parallelepiped, parallelogram, passing bell, pentagon, pentahedron, percussion, percussion instrument, percussions, percussive, pillory, polygon, polyhedron, prism, prismoid, pyramid, quadrangle, quadrant, quadrature, quadrilateral, rattle, rattlebones, rectangle, rhombohedron, rhomboid, rhombus, romance, romantic tie, rule, ruler, sacring bell, set of three, shamrock, sheepbell, sizzler, sleigh bell, snappers, square, stocks, straightedge, tam-tam, telephone bell, tercet, ternary, ternion, terzetto, tetragon, tetragram, tetrahedron, three, threesome, tierce, tintinnabula, tintinnabulum, tongue, tonitruone, trapeze, trapezium, trapezoid, treadmill, trebuchet, trefoil, trey, triad, trialogue, triangles, tricorn, trident, triennium, trihedron, trilateral, trilogy, trimester, trine, trinity, trinomial, trio, triphthong, triple crown, triple threat, triplet, triplopy, tripod, triptych, trireme, triseme, triskelion, trisul, triumvirate, triunity, trivet, troika, tubular bells, unfaithfulness, vibes, vibraphone, whipping post, wooden horse, xylophone

ROGET THESAURUS

triangle

Triality

N triality, trinity, triunity, three, triad, triplet, trey, trio, ternion, leash, shamrock, tierce, spike-team, trefoil, triangle, trident, triennium, trigon, trinomial, trionym, triplopia, tripod, trireme, triseme, triskele, triskelion, trisula, third power, cube, cube root, three, triform, trinal, trinomial, tertiary, ternary, triune, triarch, triadie, triple, tri-, tris-, tria juncta in uno.

Scourge

N scourge, rod, cane, stick, ratan, rattan, birch, birch rod, azote, blacksnake, bullwhack, chicote, kurbash, quirt, rawhide, sjambok, rod in pickle, switch, ferule, cudgel, truncheon, whip, bullwhip, lash, strap, thong, cowhide, knout, cat, cat o'nine tails, rope's end, pillory, stocks, whipping post, cucking stool, ducking stool, brank, trebuchet, trebuket, triangle, wooden horse, iron maiden, thumbscrew, boot, rack, wheel, iron heel, chinese water torture, treadmill, crank, galleys, scaffold, block, ax, guillotine, stake, cross, gallows, gibbet, tree, drop, noose, rope, halter, bowstring, death chair, electric chair, gas chamber, lethal injection, firing squad, mecate, house of correction, goaler, jailer, executioner, electrocutioner, lyncher, hangman, headsman, Jack Ketch.

Angularity

N angularity, angularness, aduncity, angle, cusp, bend, fold, notch, fork, bifurcation, elbow, knee, knuckle, ankle, groin, crotch, crutch, crane, fluke, scythe, sickle, zigzag, kimbo, akimbo, corner, nook, recess, niche, oriel, coign, right angle, obliquity, angle of 45 degrees, miter, acute angle, obtuse angle, salient angle, reentering angle, spherical angle, angular measurement, angular elevation, angular distance, angular velocity, trigonometry, goniometry, altimetry, clinometer, graphometer, goniometer, theodolite, sextant, quadrant, dichotomy, triangle, trigon, wedge, rectangle, square, lozenge, diamond, rhomb, rhombus, quadrangle, quadrilateral, parallelogram, quadrature, polygon, pentagon, hexagon, heptagon, octagon, oxygon, decagon, pyramid, cone, Platonic bodies, cube, rhomboid, tetrahedron, pentahedron, hexahedron, octahedron, dodecahedron, icosahedron, eicosahedron, prism, pyramid, parallelopiped, curb roof, gambrel roof, mansard roof, angular, bent, crooked, aduncous, uncinated, aquiline, jagged, serrated, falciform, falcated, furcated, forked, bifurcate, zigzag, furcular, hooked, dovetailed, knock kneed, crinkled, akimbo, kimbo, geniculated, oblique, fusiform, wedge-shaped, cuneiform, cuneate, multangular, oxygonal, triangular, trigonal, trilateral, quadrangular, quadrilateral, foursquare, rectangular, square, multilateral, polygonal, cubical, rhomboid, rhomboidal, pyramidal.

Musical Instruments

N musical instruments, band, string-band, brass-band, orchestra, orchestrina, monochord, polychord, harp, lyre, lute, archlute, mandola, mandolin, mandoline, guitar, zither, cither, cithern, gittern, rebeck, bandurria, bandura, banjo, bina, vina, xanorphica, viol, violin, fiddle, kit, viola, viola d'amore, viola di gamba, tenor, cremona, violoncello, bass, bass viol, base viol, theorbo, double base, contrabasso, violone, psaltery, bow, fiddlestick, piano, pianoforte, harpsichord, clavichord, clarichord, manichord, clavier, spinet, virginals, dulcimer, hurdy-gurdy, vielle, pianino, Eolian harp, organ, harmonium, harmoniphon, American organ, barrel organ, hand organ, accordion, seraphina, concertina, humming top, flute, fife, piccolo, flageolet, clarinet, claronet, basset horn, corno di bassetto, oboe, hautboy, cor Anglais, corno Inglese, bassoon, double bassoon, contrafagotto, serpent, bass clarinet, bagpipes, union pipes, musette, ocarina, Pandean pipes, reed instrument, sirene, pipe, pitch-pipe, sourdet, whistle, catcall, doodlesack, harmoniphone, horn, bugle, cornet, cornet-a-pistons, cornopean, clarion, trumpet, trombone, ophicleide, French horn, saxophone, sax, buglehorn, saxhorn, flugelhorn, althorn, helicanhorn, posthorn, sackbut, euphonium, bombardon tuba, cymbal, bell, gong, tambour, tambourine, tamborine, drum, tom-tom, tabor, tabret, tabourine, taborin, side drum, kettle drum, timpani, tympani, tymbal, timbrel, castanet, bones, musical glasses, musical stones, harmonica, sounding-board, rattle, tam-tam, zambomba, reed, tuning fork, triangle, Jew's harp, musical box, harmonicon, xylophone, sordine, sordet, sourdine, sourdet, mute, (iv) PERCEPTION OF SOUND.