dertrumn.

/ˈdəːtrəm/

Forms: Also dertron.

Etymology: modern Latin, < Greek δέρτρον beak.

Zoology.

The extremity of the upper bill of a bird when in any way distinguished from the rest of the beak.

ΚΠ

1889 in Cent. Dict.

1893 A. Newton et al. Dict. Birds: Pt. 1 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.

1959 J. Van Tyne & A. J. Berger Fund. Ornithol. 566 Dertrum. Extremity of the upper mandible (maxilla); the hook of the bill.

1964 G. 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.

This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2020).

单词	dertrum
释义	dertrumn. /ˈdəːtrəm/ Forms: Also dertron. Etymology: modern Latin, < Greek δέρτρον beak. Zoology. The extremity of the upper bill of a bird when in any way distinguished from the rest of the beak. ΚΠ 1889 in Cent. Dict. 1893 A. Newton et al. Dict. Birds: Pt. 1 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. 1959 J. Van Tyne & A. J. Berger Fund. Ornithol. 566 Dertrum. Extremity of the upper mandible (maxilla); the hook of the bill. 1964 G. 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. This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2020). < n.1889
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