| 单词 | ploughshare bone |
| 释义 | > as lemmasploughshare bone ploughshare bone n. (a) Anatomy the vomer (now rare or disused); (b) Ornithology the pygostyle of a bird. ΘΚΠ the world > animals > animal body > general parts > constituent materials > [noun] > vomer ploughshare bone1777 the world > animals > birds > parts of or bird defined by > [noun] > tail > bone in ploughshare bone1777 pygostyle1868 vomer1872 1777 tr. B. S. Albinus Tables Skeleton & Muscles 1 The os vomer, or plow-share bone. 1831 Encycl. Brit. II. 778/2 The vomer or plough~share bone is symmetrical,..forming the posterior part of the nasal partition. 1835–6 Todd's Cycl. Anat. & Physiol. I. 291/2 The Ischio-coccygeus..extending..to the sides of the..plough~share bone. a1933 J. A. Thomson Biol. for Everyman (1934) I. xx. 542 In all modern flying birds..there is a fusion of about four terminal vertebrae to form the ploughshare-bone or pygostyle. 1997 New Scientist 1 Feb. 30/3 A pygostyle (or ploughshare bone) made of between four and seven fused tail vertebrae to support the tail feathers. < as lemmas |
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