英语词汇“dertrum”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	dertrum
释义	dertrum Zool.\|ˈdɜːtrəm\| Also dertron. [mod.L., ad. Gr. δέρτρον beak.] The extremity of the upper bill of a bird when in any way distinguished from the rest of the beak. 1889in Cent. Dict.1893A. Newton Dict. Birds i. 33 Various parts of the rostrum have received special names: culmen, the dorsal ridge of the upper bill; apex or tip; dertrum, in which it often terminates.1959Van Tyne & Berger Fund. Ornith. 566 Dertrum. Extremity of the upper mandible (maxilla); the hook of the bill.1964G. R. Mountfort in A. L. Thomson New Dict. Birds 93/1 Upper mandible... may be divided into the culmen, or dorsal ridge from the tip (dertrum) of the bill to the forehead, and the upper mandibular tomia, or lateral cutting edges.
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