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dertrum

[dur-truh m] /ˈdɜr trəm/
noun, plural dertra
[dur-truh] /ˈdɜr trə/ (Show IPA).
Ornithology
1.
the extremity of the maxilla of a bird's bill, especially when hooked or differentiated from the rest of the bill, as in pigeons and plovers.
Origin
1885-1890
1885-90; < New Latin < Greek dértron membrane, derivative of dérein to skin; compare dérma derma1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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