Definition of sextant noun from the Oxford Advanced Learner's Dictionary

 

sextant

 noun
noun
BrE BrE//ˈsekstənt//
 
; NAmE NAmE//ˈsekstənt//
 
 
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an instrument for measuring angles and distances, used to calculate the exact position of a ship or an aircraft Word Origin late 16th cent. (denoting the sixth part of a circle): from Latin sextans, sextant- ‘sixth part’, from sextus ‘sixth’.
See the Oxford Advanced American Dictionary entry: sextant