WordReference Random House Unabridged Dictionary of American English © 2025
Ja′cob's staff′, pl. Jacob's staves. 
  1. Astronomycross-staff.
  2. Surveyinga pole providing a firm support for a compass or other instrument.
  • 1540–50

Collins Concise English Dictionary © HarperCollins Publishers::
Jacob's staff
  1. a medieval instrument for measuring heights and distances
'Jacob's staff' also found in these entries (note: many are not synonyms or translations):
cross-staff

Forum discussions with the word(s) "Jacob's staff" in the title:


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