I. ˈtrīˌgän noun
( -s )
Etymology: Latin trigonum, from Greek trigōnon, from neuter of trigōnos three-cornered, triangular, from tri- three + -gōnos -cornered, -angled (from gōnia corner, angle) — more at tri- , -gon
1. : triangle
2.
a. : triplicity 1
b. : trine 2
3. : an ancient triangular harp of oriental and perhaps Assyrian origin having four strings and a shrill tone and often used for banquet music — called also sabbeka, sackbut, sambuca
4. : the cutting region of the crown of an upper molar that usually comprises the anterior part and includes the protocone, paracone, and metacone
II. abbreviation
trigonometric; trigonometrical; trigonometry