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stadia hairs

 - 1 dictionary result

sta⋅di⋅a

1[stey-dee-uh]
–noun
1. a method of surveying in which distances are read by noting the interval on a graduated rod intercepted by two parallel cross hairs (stadia hairs or stadia wires) mounted in the telescope of a surveying instrument, the rod being placed at one end of the distance to be measured and the surveying instrument at the other.
–adjective
2. pertaining to such a method of surveying.

Origin:
1860–65; prob. special use of stadia 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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