— trigonometric /trig'euh neuh me"trik/ , trigonometrical , adj. — trigonometrically , adv.
/trig'euh nom"i tree/ , n.
the branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the calculations based on them.
[ 1605-15; trigonometria; see TRIGON, -O-, -METRY ]