| 释义 |
semi-ˈcylinder
[semi- 7 a.]
The half of a cylinder divided longitudinally.
1666Collins in Rigaud Corr. Sci. Men (1841) II. 461 In the concave of the said semicylinder. 1777G. Forster Voy. round World I. 228 This and the first trumpet were both made of two hollow semicylinders of wood. 1841S. Clegg Manuf. Coal-Gas 60 The scoop is a semi-cylinder made of thin plate iron. 1880C. & F. Darwin Movem. Pl. 81 One of the two cotyledons failed to produce a petiole, whilst the other produced one consisting of an open semi⁓cylinder ending in a sharp point.
Hence semicyˈlindric, -cyˈlindrical adjs., of the form of a semi-cylinder.
1731Bailey (ed. 2), Semicylindrical. 1760Lee Introd. Bot. iii. v. (1765) 185 Semicylindric, like a halved Cylinder; when they are round on one side, and flat on the other. 1793Phil. Trans. LXXXIV. 10 The semicylindric cavity. 1801Ibid. XCI. 131 The thermometer, having its scale⁓board..of a semicylindrical form. 1842Gwilt Archit. §217 Semicylindrical vaults. 1870Hooker Stud. Flora 147 Water-Purslane..placentas semicylindric. |