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).

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). < adj.n.1951
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