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Found 1 definition: triangular.

Pos: Adjective

[WORDNET DICTIONARY]

Adjective triangular has 2 senses

1. triangular(s = adj.all) - having three angles; forming or shaped like a triangle; "a triangular figure"; "a triangular pyrimid has a triangle for a base"
Derived forms noun triangle₁, noun triangularity₁

2. triangular(s = adj.all) three-sided, trilateral - having three sides; "a trilateral figure"
Derived forms noun triangle₁, noun triangularity₁

[CIDE DICTIONARY]

triangular, a. [L. triangularis: cf. F. triangulaire.].

1. Having three angles; having the form of a triangle. [1913 Webster]

2. Oblong or elongated, and having three lateral angles; as, a triangular seed, leaf, or stem. [1913 Webster]

Triangular compasses, compasses with three legs for taking off the angular points of a triangle, or any three points at the same time. -- Triangular crab (Zoöl.), any maioid crab; -- so called because the carapace is usually triangular. -- Triangular numbers (Math.), the series of numbers formed by the successive sums of the terms of an arithmetical progression, of which the first term and the common difference are 1. See Figurate numbers, under Figurate.

[OXFORD DICTIONARY]

triangular, adj.
1 triangle-shaped, three-cornered.
2 (of a contest or treaty etc.) between three persons or parties.
3 (of a pyramid) having a three-sided base.

Derivative:
triangularity n. triangularly adv.

Etymology:
LL triangularis (as TRIANGLE)

[ROGET DICTIONARY]

Trisection

N trisection, tripartition, trichotomy, third, third part, trifid, trisected, tripartite, trichotomous, trisulcate, Triadelphous, triangular, tricuspid, tricapsular, tridental, tridentate, tridentiferous, trifoliate, trifurcate, trigonal, trigrammic, trigrammatic, tripetalous, tripodal, tripodic, triquetral, triquetrous.

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.

[RELATED WORDS]

triangular bandage, triangular prism