Definition of sextants:
(n) :
(nautical) A navigational device for deriving angular distances between objects so as to determine latitude and longitude.
(n) :
(geometry) One sixth of a circle or disc; a sector with an angle of 60°.
(n) :
(dentistry) One of six groups of adjacent teeth, excluding the wisdom teeth.
(n) :
(botany) A radial cell division of segments in three series, a sixth part of the original.
(n) :
(astronomy) The constellation Sextans.