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 (ăk-tĭn′ē-ən) also ac·tin·i·a (-ə)
n. pl. ac·tin·i·ans also ac·tin·i·ae (-ē-ē′)
A sea anemone.

[New Latin Actīnia, genus name, from Greek aktīs, aktīn-, ray; see actino-.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -tiniae (-ˈtɪnɪˌiː) or -tinias
(Animals) any sea anemone of the genus Actinia, which are common in rock pools. Also called: actinian
[C18: New Latin, literally: things having a radial structure. See actino-, -ia]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.actinia - a genus of sea anemone common in rock poolsActinia - a genus of sea anemone common in rock pools
coelenterate genus - a genus of coelenterates
2.actinia - any sea anemone or related animalactinia - any sea anemone or related animal  
sea anemone, anemone - marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
Many marine animals seem to have this power of stinging: besides the Portuguese man-of-war, many jelly-fish, and the Aplysia or sea-slug of the Cape de Verd Islands, it is stated in the voyage of the Astrolabe, that an Actinia or sea-anemone, as well as a flexible coralline allied to Sertularia, both possess this means of offence or defence.
Divergence of nematocysts in two colour morphs of the intertidal beadlet Actinia equina.
The effects of sexual and asexual reproduction on geographic variation in the sea anemone Actinia tenebrosa.
Enraizamento de estacas semilenhosas de maracujazeiro amarelo (Passiflora actinia Hook).
1996); la equistatina, un inhibidor de cistein-proteasas, obtenido de Actinia equina, pesa 13 kDa (Lenarcic et al.
Hutton and Smith (1996) reported the isolation of "amoebocytes" from the mesenteric filaments (tissue including gastroderm and mesoglea) of the sea anemone Actinia equina that are capable of phagocytosis and killing gram-negative bacteria.
Hydraulic skeletons are found in living things such as earthworm and actinia. The hydraulic skeleton actuator in this study is made of flexible bags.
Equinatoxin II, a pore-forming toxin from the sea anemone Actinia equina, can bind to membranes and create cation-selective pores (Hong et al.