dertrum

[dur-truhm]

noun, plural der·tra

[-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.

Origin:
1885–90; < Neo-Latin < Greek dértron membrane, derivative of dérein to skin; compare dérma derma¹

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Dertrum is always a great word to know.

So is doohickey. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a gadget; dingus; thingumbob.

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