goniometer

 
Pronunciation: /ˌgəʊnɪˈɒmɪtə/

noun

  • an instrument for the precise measurement of angles, especially one used to measure the angles between the faces of crystals.

Derivatives

goniometric

Pronunciation: /-əˈmɛtrɪk/
adjective

goniometrical

Pronunciation: /-əˈmɛtrɪk(ə)l/
adjective

goniometry

noun

Origin:

mid 18th century: from French goniomètre, from Greek gōnia 'angle' + French -mètre '(instrument) measuring'