dertrum

American  

[dur-truhm] / ˈdɜr trəm /

noun

Ornithology.

plural

dertra

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.

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Etymology

Origin of dertrum

1885–90; < New Latin < Greek dértron membrane, derivative of dérein to skin; compare dérma derma ¹