| 单词 |
protrusion |
| 释义 |
protrusion|prəʊˈtruːʒən|
[a. F. protrusion, ad. L. type *prōtrūsiōn-em, n. of action f. prōtrūd-ĕre to protrude.]
1. The action of protruding (in various senses of the vb.); the fact or condition of being protruded.
†a. Thrusting forward or onward. Obs.
1646Sir T. Browne Pseud. Ep. vii. xviii. 381 He was..not to bee removed by the force or protrusion of three men. 1660Boyle New Exp. Phys. Mech. i. 21 You will finde the Sucker forcibly carryed up to the top of the Cylinder, by the protrusion of the external Air. 1727Bradley Fam. Dict. s.v. Cantharides, Such Motions as are necessary for the Protrusion forwards or Ejectment of the Water.
b. The action of thrusting or pushing out an attached part; the condition of being protruded.
1646Sir T. Browne Pseud. Ep. iii. xvii. 148 That the distinctive parts of sexes are onely different in position, that is inversion or protrusion. 1783Pott Chirurg. Wks. II. 13 The falling down or protrusion of some part. 1833Lyell Princ. Geol. III. 340 The notion of deluges accompanying the protrusion of mountain-chains. 1880C. & F. Darwin Movem. Pl. 62 Shortly before the protrusion of the leaves.
c. The fact of projecting or jutting out.
1853Kane Grinnell Exp. viii. (1856) 56 The protrusion of these abutting faces into the waters of the sound.
2. concr. That which protrudes or juts out; a protruded part, a protuberance, a prominence.
1704Swift T. Tub xi. Wks. 1760 I. 123 [They] looked upon all extraordinary dilatations of that member as protrusions of zeal, or spiritual excrescencies. 1805Med. Jrnl. XIV. 19 Between this ridge and the protrusion above-mentioned. 1862S. Lucas Secularia 96 The fantastic gables, pinnacles, and protrusions, which intercepted the light. 1884Bower & Scott De Bary's Phaner. 66 They..are covered by a protrusion of the epidermis. |
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