noun, plural actiniae [ak-tin-ee-ee] , actinias.
a sea anemone, especially of the genus Actinia.

1740–50; < Neo-Latin; see actin-, -ia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actinia (ækˈtɪnɪə)
n , pl -tiniae, -tinias
any sea anemone of the genus Actinia, which are common in rock pools
[C18: New Latin, literally: things having a radial structure. See actino-, -ia]

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