“dertrum”的英文意思_释义_用法

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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