Answer: trigon

AnswerCrossword Clue
TRIGONThree-sided figure
TRIGONTriangle.
TRIGONAncient Greek instrument
TRIGONClass often taken before calculus: Abbr.
TRIGONAncient three-sided harp
trigonan ancient stringed instrument
trigontriangle
trigonancient Greek stringed instrument with a triangular shape
trigontriplicity 1