• WordNet 3.6
    • n actinia any sea anemone or related animal
    • n Actinia a genus of sea anemone common in rock pools
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Webster's Revised Unabridged Dictionary
    • n Actinia (Zoöl) An animal of the class Anthozoa, and family Actinidæ. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.].
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Century Dictionary and Cyclopedia
    • n actinia Agenus of zoöphytes, belonging to the Radiata of Cuvier, regarded as the type of the order Malacodermata, subclass Zoantharia, class Actinozoa, subkingdom Cælenterata, in modern classification. The body is cylindrical, and is attached by one extremity, the mouth occupying the middle of the upper or free extremity. The mouth is surrounded by concentric circles of tentacles, which when spread resemble the petals of a flower, whence the popular names animal-flowers and sea-anemones (which see). They are not perfectly radíal in symmetry, the common polyp of the sea-shore, A. mesembryanthemum, having the oral aperture slightly elliptical, the long axis being marked by a tubercle at either end; the animal thus presents a faint but well-marked indication of bilateral symmetry. They move by alternately contracting and expanding their bases, and by their tentacles. The species are often of brilliant colors; many of them are used as food. See Actinozoa.
    • n actinia An animal of the genus Actinia or family Actiniidæ.
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Chambers's Twentieth Century Dictionary
    • n Actinia ak-tin′i-a a genus of marine animals of the class Polypi, growing on rocks or shells, with numerous tentacles or rays like the petals of a flower, from which they are often called animal flowers or sea-anemones.
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Webster's Revised Unabridged Dictionary
Latinized fr. Gr. , , ray
Chambers's Twentieth Century Dictionary
From Gr. aktis, aktinos, a ray.


In literature:

An important member of the zoophyte family, and one often introduced into aquaria, is the actinia, or sea-anemone, sometimes called sea-rose.
"Harper's Young People, April 13, 1880" by Various
The first twelve mesenteries are disposed in couples, and do not differ from those of Actinia except in size.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2" by Various
Of the lowest among these orders, the Actinoid Polyps, our Actinia or sea-anemone is a good example.
"Seaside Studies in Natural History" by Elizabeth Cabot Cary Agassiz
The pure white body of the neighbouring actinia renders it more observable.
"Curiosities of Civilization" by Andrew Wynter