Word not found in any official scrabble dictionaries.
"Cross-staff" Definition
noun
An early navigational instrument, consisting of a wooden rod with a sliding crosspiece, used for measuring the altitude of a star; it developed into the sextant.
Source: Wiktionary
A surveyor's instrument for measuring offsets.
Source: Wiktionary
An instrument formerly used at sea for taking the altitudes of celestial bodies.
An instrument formerly used to take the altitude of the sun or stars. it was superseded by the quadrant. also called forc-staff.
Source: Century Dictionary
In surveying, an instrument consisting of a staff carrying a brass circle divided into four equal parts or quadrants by two lines intersecting each other at the center.
Source: Century Dictionary