One of the mysteries of the English language finally explained.
1historical, rare A proposed unit of the intensity of solar radiation. rare. Now historical.
Zoology. Each of the rays or points of a sponge spicule.
Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. From ancient Greek ἀκτῖν-, ἀκτίς ray. With use in sense 1 compare quot. 1837, and also German † Actine.
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