[sex.tant] n [NL sextant-, sextans sixth part of a circle, fr. L, sixth part, fr. sextus sixth] (1628): an instrument for measuring angular distances used esp. in navigation to observe altitudes of celestial bodies (as in ascertaining latitude and longitude)
SEXTANT
Meaning of SEXTANT in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012