| 释义 |
half-round, a. and n.
A. adj. Semicircular, in shape or section; semicylindrical; as half-bead, half-round bit, half-round channel, half-round chisel, half-round drill, half-round file, half-round gutter, -round, half-round screw.
half-round spade (Whaling), a spade with a blade resembling a carpenter's gouge, used in cutting the blanket piece free from the carcase.
1662J. Davies tr. Mandelslo's Trav. 57 Baths..which were made all halfround. 1671Milton Samson 1606 A spacious Theatre Half-round on two main Pillars. 1703Moxon Mech. Exerc. 36 With the edge of an half-round File. Ibid. 193 Half-round holes or Semi-circles. 1884F. J. Britten Watch & Clockm. 95 For long holes of large diameter nothing beats a half-round drill. 1888Lockwood's Dict. Mech. Engin. (1918) 169 Half-round chisel. 1934Burlington Mag. Nov. 209/2 Chinese details, such as the half-round beads ending in small volutes. 1940Chambers's Techn. Dict. 122/2 Button-headed screws, screws having hemispherical heads, slotted for a screwdriver; known also as half-round screws. 1967Gloss. Sanitation Terms (B.S.I.) 13 Half-round channel, a channel (def. 2) of semi-circular cross section. Ibid. 23 Half round gutter, an eaves gutter having a half round cross section.
B. n.
a. A semicircle; a hemispherical figure.
1718Prior Knowledge 638 This fair half-round, this ample azure sky. a1721― Her Right Name 11 In her forehead's fair half-round. 1811Self Instructor 27 In the midst of the half-round [of the quill]. 1867Common Sense Cook Bk. 38 Half-Round of Beef should be put into cold water.
b. Arch. ‘A semicircular moulding which may be a bead or torus’ (Gwilt Archit. 1842–76).
So † half-rounding a., forming a semicircle.
1667Milton P.L. iv. 862 The western point, where those half-rounding guards Just met, and closing stood in squadron joind. |