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2017 Word of the Year

wing formula

noun, Ornithology.
1.
a numerical representation of the relative lengths of the primary feathers of a bird's wing, used in identifying similar species, as flycatchers.
Origin of wing formula
1935-1940
First recorded in 1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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8
10
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