noun, plural dertra [dur-truh] . Ornithology.
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.

1885–90; < Neo-Latin < Greek dértron membrane, derivative of dérein to skin; compare dérma derma1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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