actino-uraniumn.

Brit.

/ˌaktᵻnə(ʊ)jᵿˈreɪnɪəm/, U.S.

/ˌæktənoʊˌjʊˈreɪniəm/,

/ˌæktənoʊˌjuˈreɪniəm/

Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: actinium n., -o- connective, uranium n.

Etymology: < actin- (in actinium n.) + -o- connective + uranium n., after French actinuranium (A. Piccard 1917, in Arch. des sci. physiques et nat. 44 161); so called because actinium results from the radioactive decay of this isotope.

Chemistry and Physics. Now historical.

The (fissile) isotope of uranium of mass number 235.A higher mass number was at first inferred for this isotope.

ΚΠ

1918 Science 3 May 442/1 A long-lived element of atomic weight ‘about 240’ which is the parent of the actinium series of elements... This ‘actino-uranium’ is supposed to undergo an alpha ray change to form uranium Y.

1929 E. Rutherford in Nature 2 Mar. 313/2 We shall first discuss the probable mass of this new isotope, which for convenience will be called actino-uranium. It seems simplest to suppose that its mass is 235.

1958 H. J. Gray Dict. Physics 14/1 Actino-uranium..is explosive when in sufficiently high concentration, owing to nuclear fission.

1978 H. Wouk War & Remembrance viii. 77 An isotope discovered only four years earlier, called U-235 or actino-uranium.

2001 L. E. Nyquist et al. in J. A. M. Bleeker et al. Cent. Space Sci. lv. 1327/2 Rutherford..inferred its ultimate source as an isotope of uranium, of mass 235, which he called actino-uranium.

This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).

单词	actino-uranium
释义	actino-uraniumn. Brit. /ˌaktᵻnə(ʊ)jᵿˈreɪnɪəm/, U.S. /ˌæktənoʊˌjʊˈreɪniəm/, /ˌæktənoʊˌjuˈreɪniəm/ Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: actinium n., -o- connective, uranium n. Etymology: < actin- (in actinium n.) + -o- connective + uranium n., after French actinuranium (A. Piccard 1917, in Arch. des sci. physiques et nat. 44 161); so called because actinium results from the radioactive decay of this isotope. Chemistry and Physics. Now historical. The (fissile) isotope of uranium of mass number 235.A higher mass number was at first inferred for this isotope. ΚΠ 1918 Science 3 May 442/1 A long-lived element of atomic weight ‘about 240’ which is the parent of the actinium series of elements... This ‘actino-uranium’ is supposed to undergo an alpha ray change to form uranium Y. 1929 E. Rutherford in Nature 2 Mar. 313/2 We shall first discuss the probable mass of this new isotope, which for convenience will be called actino-uranium. It seems simplest to suppose that its mass is 235. 1958 H. J. Gray Dict. Physics 14/1 Actino-uranium..is explosive when in sufficiently high concentration, owing to nuclear fission. 1978 H. Wouk War & Remembrance viii. 77 An isotope discovered only four years earlier, called U-235 or actino-uranium. 2001 L. E. Nyquist et al. in J. A. M. Bleeker et al. Cent. Space Sci. lv. 1327/2 Rutherford..inferred its ultimate source as an isotope of uranium, of mass 235, which he called actino-uranium. This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021). < n.1918
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