actine
(ˈæktɪn)
[ad. Gr. ἀκτῖν- ray.]
1. (See quot.)
| 1849 Sir J. Herschel in Adm. Man. Sci. Enq. 295 The abstract unit of solar radiation to be adopted in the ultimate reduction of the actinometric observations is the actine. |
2. A ‘ray’ or radiating part of a sponge-spicule.
| 1887 Sollas in Encycl. Brit. XXII. 416/2 Two actines soldered together by intervening silica. |