dertrum

[ dur-truhm ]
/ ˈdɜr trəm /

noun, plural der·tra [dur-truh]. /ˈdɜr trə/. 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.

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Origin of dertrum

1885–90; <New Latin <Greek dértron membrane, derivative of dérein to skin; compare dérmaderma1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020