- dertrum
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/derr"treuhm/, n., pl. dertra /-treuh/. Ornith.the extremity of the maxilla of a bird's bill, esp. when hooked or differentiated from the rest of the bill, as in pigeons and plovers.[1885-90; < NL < Gk dértron membrane, deriv. of dérein to skin; cf. dérma DERMA1]
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Universalium. 2010.