dertrum

[dur-truhm]

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.

Word History and Origins

Origin of dertrum¹

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