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Webster 1913 Edition


Cross-staff

Cross′-staffˊ

(-st?fˊ)
,
Noun.
1.
An instrument formerly used at sea for taking the altitudes of celestial bodies.
2.
A surveyor’s instrument for measuring offsets.

Webster 1828 Edition


Cross-staff

CROSS-STAFF

,
Noun.
An instrument to take the altitude of the sun or stars.

Definition 2022


cross-staff

cross-staff

English

Noun

cross-staff (plural cross-staffs)

  1. (nautical) 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
  2. A surveyor's instrument for measuring offsets.