单词 | air hole |
释义 | air holen. 1. A hole or passage to admit air; esp. a hole in a layer of ice formed over deep water, providing a breathing-place for aquatic animals or divers. ΘΚΠ the world > matter > gas > air > fresh air > [noun] > supplying fresh air or ventilation > ventilator > ventilation opening or hole breathinga1387 suspiralc1430 breathing hole?1440 wind-ventc1450 air hole1601 spiracle1620 ventage1623 spirament1654 wind-hole1683 spiraculuma1734 blowhole1858 1601 Contract 10 Oct. in G. Dallas Syst. Stiles (1697) 769 For making..and upholding of Sinks, Syers, Gutters, Eyes, Levands, Pots, Air-holls, Stairs and Passages [in a coal mine]. 1665 R. Boyle New Exper. & Observ. Cold 633 They were careful to break the ice in eight or ten several places, to make so many, either vents or Air-holes, for the preservation..of the Fish. 1705 C. Mystagogus Trifertes Sagani v. 47 If there be any Air hole, the Water will Bubble. 1766 T. Smollett Trav. France & Italy I. xvi. 264 He said that there were air-holes at certain distances (and indeed I saw one of these). 1829 G. Head Forest Scenes N. Amer. 47 These air-holes..are met with at times, no matter what the thickness of the ice may be. 1876 W. Boyd in J. R. Bartlett Dict. Americanisms (ed. 4) The ice on the St. Lawrence at Montreal never becomes stationary for the winter until one or more air-holes have formed in it in that neighbourhood. 1883 C. Holder in Harper's Mag. Jan. 190/1 The air-holes open and shut at the will of the insect. 1960 F. G. Mann & B. C. Saunders Pract. Org. Chem. (ed. 4) iv. 476 The Bunsen burner,..with the air-hole wide open, and the cone in place, is carefully introduced under the combustion tube. 1992 S. Sigfusson Sigfusson's Roads x. 72 Air holes were nature's equalizing pressure valves; they formed in the ice, and freighters constantly brooded about them because technically they were weak spots. 2002 J. Eugenides Middlesex i. 5 He found my grandparents' bed and, under it, the silkworm box. Carved from olivewood..it had a tin lid perforated by tiny airholes. 2. Metallurgy. A cavity in a metal casting, produced by the escape of air through the liquid metal. Now rare. ΘΚΠ society > occupation and work > materials > derived or manufactured material > metal > qualities of metals > [noun] > imperfections > cavities in casting blowhole1691 sand-hole1691 air bladder1803 air hole1813 pipe1861 pinhole1906 1813 R. Southey Life Nelson vii. 249 [The guns] were probably originally faulty, for the fragments were full of little air-holes. 1857 Jrnl. Soc. Arts 27 Mar. 289/2 It was found to be very difficult to prevent the moulds being affected by air-holes, which in the casting produced what was technically termed by the stereotyper ‘picks’. 1981 Amer. Jrnl. Archeol. 85 254/2 The well forged condition is attributable to one or both of the following causes: careful working of the bloom to extrude slag and to eliminate air holes, or prolonged forging to shape. This entry has been updated (OED Third Edition, June 2008; most recently modified version published online December 2021). < n.1601 |
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