| 单词 |
micrometre |
| 释义 |
micrometre|ˈmaɪkrəʊmiːtə(r)|
Also (U.S.) -meter.
[f. micro- 5 a + metre n.2]
A millionth of a metre: = micron.
The word has only recently become common (cf. quot. 1968), and now forms part of the International System of Units.
1880Jrnl. R. Microsc. Soc. III. 327 The same reasoning..leads us, however, to recommend the adoption of ‘micrometre’ instead of ‘micromillimetre’, which would secure the uniformity desired, besides being a more convenient word. 1966Kaye & Laby Tables Physical & Chem. Constants (ed. 13) 2, µ is widely employed as an abbreviation of µm (10-6 m or micrometre) and is then called micron. 1968Nature 16 Nov. 651/2 By resolution No. 7 the conference [sc. the thirteenth General Conference of Weights and Measures] decided to proscribe further use of the name ‘micron’, with the symbol µ attributed to this name, for the millionth part of the metre. The symbol µ is now the recognized prefix for the decimal sub-multiple 10-6 and the appropriate name for the millionth part of the metre is ‘micrometre’, with symbol µm. 1971I. G. Gass et al. Understanding Earth xiv. 336/1 (caption) The amplitude..used for determining the magnitude is half the displacement between the two arrows—in this case 5 micrometres. 1973Physics Bull. Nov. 662/3 They contain solid particles..with dimensions of about a tenth of a micrometre, a mass of 10-15 g each. 1974Sci. Amer. July 45 (Advt.), Neutron radiography can resolve a few micrometers. |
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