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Webster's 1828 Dictionary

FORESTAFF

n.An instrument used at sea, for taking the altitudes of heavenly bodies; called also cross-staff.

 

Webster's 1913 Dictionary

FORESTAFF

FORESTAFF Fore "staff `, n. (Naut. )

 

Defn: An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross- staff. Brande & C.