Jacob\'s staff

Jacob's staff

noun, plural Jacob's staves.
1.
Astronomy. cross-staff.
2.
Surveying. a pole providing a firm support for a compass or other instrument.

Origin:
1540–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Jacob's staff is always a great word to know.
So is alpha. Does it mean:
used to designate the brightest star in a constellation
the gaseous envelope surrounding a heavenly body
Collins
World English Dictionary
Jacob's staff
 
n
a medieval instrument for measuring heights and distances

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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