Actinia :: Actinia (n.) An animal of the class Anthozoa, and family Actinidae. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.]..

Actinia :: Actinia (n.) A genus in the family Actinidae.

Actiniae :: Actiniae (pl. ) of Actini.

Actinias :: Actinias (pl. ) of Actini.

Actinic :: Actinic (a.) Of or pertaining to actinism; as, actinic rays..

Actiniform :: Actiniform (a.) Having a radiated form, like a sea anemone..

Actinism :: Actinism (n.) The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography..

Actinium :: Actinium (n.) A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light..

Adiactinic :: Adiactinic (a.) Not transmitting the actinic rays.

Diactinic :: Diactinic (a.) Capable of transmitting the chemical or actinic rays of light; as, diactinic media..

Hexactinia :: Hexactinia (n. pl.) The Anthozoa.

Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata..

Polyactinia :: Polyactinia (n. pl.) An old name for those Anthozoa which, like the actinias, have numerous simple tentacles..

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