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An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross-staff.

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 n. An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross-staff.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 An instrument formerly used at sea for taking the altitudes of heavenly bodies, now superseded by the sextant; -- called also cross- staff.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 An instrument formerly used at sea for taking the altitudes ofheavenly bodies, now superseded by the sextant; -- called also cross-staff.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