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单词 microfocus
释义

microfocusadj.n.

Brit. /ˈmʌɪkrə(ʊ)ˌfəʊkəs/, U.S. /ˈmaɪkroʊˌfoʊkəs/
Inflections: Plural (in sense B.) microfoci Brit. /ˌmʌɪkrə(ʊ)ˈfəʊkʌɪ/, /ˌmʌɪkrə(ʊ)ˈfəʊsʌɪ/, U.S. /ˈˌmaɪkrəˈfoʊˌsaɪ/.
Origin: Formed within English, by compounding. Etymons: micro- comb. form, focus n.
Etymology: < micro- comb. form + focus n.
A. adj.
Capable of being focused on a very small area; spec. (of an X-ray tube or other radiation source) having a very small focal spot (typically a few microns in diameter).
ΚΠ
1951 Science 7 Dec. 615/2 Of considerable interest will be the exhibit of the new Hilger Micro-focus X-ray tube.
1960 Science 21 Oct. 1073 Microfocus X-ray analyzer/ a specialized device for x-ray chemical analysis... Unexcelled for identification of minute impurities or inclusions in small samples.
1979 Philos. Trans. (Royal Soc.) A. 292 149 Microfocus X-ray tubes..have been developed with focal spots between 10 and 100 μm.
1992 New Scientist 14 Mar. 33/1 Advanced X-ray optics will figure in one of the first beamlines to be ready, the microfocus beamline. It will exploit a wiggler producing tunable radiation with up to 40 keV of energy focused to a tiny spot only 10 micrometres across.
1999 Dentomaxillofacial Radiol. 28 249 Radiographs of anatomical specimens and extracted teeth were prepared under clinical conditions using a microfocus (8 and 16 microns focal diameter) X-ray tube.
B. n. Medicine.
A small (often microscopic) centre of infection or disease, esp. in a culture, tissue, or organ.
ΚΠ
1964 Lancet 20 June 1365/1 Further experience with these cells and changes in technique have enabled us to recognise focal changes either by low-power microscopy (microfoci) or later by the naked eye (macroplaques).
1978 Brit. Jrnl. Pharmacol. 62 289 A technique is described for the induction of an acute short-lived epileptiform focus... The effects of anticonvulsants on this microfocus have been studied.
1989 Amer. Jrnl. Surg. Pathol. 13 5 Microinvasive carcinoma..includes a microfocus of submucosal invasion within 1-2 mm of the overlying epithelial basal lamina.
1998 Jrnl. Obstetrics & Gynecol. Res. 24 27 In addition, the left tube contained 3 scattered lesions of carcinoma in situ, one of which was accompanied by a microfocus of definite stromal invasion confined within the endosalpingeal mucosa.
This is a new entry (OED Third Edition, December 2001; most recently modified version published online March 2022).
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adj.n.1951
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