| 单词 |
pneumatize |
| 释义 |
pneumatize, v.|ˈpnjuːmətaɪz, ˈnjuː-|
[f. Gr. πνευµατ- (see next) + -ize; cf. Gr. πνευµατίζειν to fan by blowing.]
1. trans. To pass a blast of air through (molten metal) in the process of converting it into steel by the Bessemer process. rare.
1868Joynson Metals 86 The silica which is found in Spiegeleisen has the effect of reducing the boiling or agitation of the pneumatised metal, when poured into moulds, and is therefore beneficial.
2. To furnish with air-cavities, render pneumatic: see pneumatic a. 3 b. Chiefly as ˈpneumatized pa. pple. Hence ˈpneumatizing vbl. n.
1890Coues Ornith. ii. iv. 200 Ordinarily, the greater part of the skull, and the lesser part of the trunk and limbs, is pneumatised. 1947Arch. Otolaryngol. XLVI. 852 The complications of acute otitis media developed more often in temporal bones with extensive cell systems than in those that were poorly pneumatized. 1949L. R. Boies et al. Fund. Otolaryngol. i. 11 The temporal bone is pneumatized by the extension of an epithelial sac from the middle ear into the bone marrow in the region of the mastoid process. Ibid. 12 Any interference with..development will cause a cessation of the pneumatizing process. 1971Sci. Amer. Dec. 73/3 All birds have..lungs, air sacs and pneumatized bones. 1976Nature 19 Aug. 683/2 [In a dinosaur] the nasals, in addition to being pneumatised as a whole, each bear a large air chamber connected with the external nare. |
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单词 pneumatization 释义 pneumatization Med.|njumtazen|[f. next + -ation.]The development ......