trigonometry
Word family nountrigonometertrigonometryadjectivetrigonometricadverbtrigonometrically
trig·o·nom·e·try /ˌtrɪɡəˈnɒmətri $ -ˈnɑː-/ noun [uncountableU] Origin trigonometry (1600-1700) Modern Latin trigonometria, from Greek trigonon “triangle” + -metria “measuring”