rayometern.

Brit.

/reɪˈɒmᵻtə/, U.S.

/reɪˈɑmədər/

Origin: Formed within English, by compounding. Etymons: ray n.⁵, -ometer comb. form.

Etymology: < ray n.⁵ + -ometer comb. form.

rare. Now disused.

Any of several instruments used in the measurement of radiant energy or light (see quots.).

ΚΠ

1873 Year-bk. Facts Sci. & Arts 203 Electric rayrometer [sic]... The remainder of the lecture was devoted to the elucidation of the principles involved in the application of electrical resistance to the measurement of temperatures by the ingenious apparatus invented by Mr. C. William Siemens.

1873 Year-bk. Facts. Sci. & Arts Index 286/1 Electric Rayometer.

1897 E. J. Wall & T. Bolas Dict. Photogr. (ed. 7) 499 Rayometer, a kind of actinometer (generally a screen of aluminium of graduated thickness) used in testing sensitiveness to X rays.

1950 O. Glasser Med. Physics II. 626/1 Such instruments as the lensometer, vertometer and rayometer are designed to measure the vertex powers of lenses directly, or their effective powers.

This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022).

单词	rayometer
释义	rayometern. Brit. /reɪˈɒmᵻtə/, U.S. /reɪˈɑmədər/ Origin: Formed within English, by compounding. Etymons: ray n.⁵, -ometer comb. form. Etymology: < ray n.⁵ + -ometer comb. form. rare. Now disused. Any of several instruments used in the measurement of radiant energy or light (see quots.). ΚΠ 1873 Year-bk. Facts Sci. & Arts 203 Electric rayrometer [sic]... The remainder of the lecture was devoted to the elucidation of the principles involved in the application of electrical resistance to the measurement of temperatures by the ingenious apparatus invented by Mr. C. William Siemens. 1873 Year-bk. Facts. Sci. & Arts Index 286/1 Electric Rayometer. 1897 E. J. Wall & T. Bolas Dict. Photogr. (ed. 7) 499 Rayometer, a kind of actinometer (generally a screen of aluminium of graduated thickness) used in testing sensitiveness to X rays. 1950 O. Glasser Med. Physics II. 626/1 Such instruments as the lensometer, vertometer and rayometer are designed to measure the vertex powers of lenses directly, or their effective powers. This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022). < n.1873
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