( n. )
The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument
( n. )
The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012