sea anemone

noun
any sedentary marine animal of the phylum Coelenterata, having a columnar body and one or more circles of tentacles surrounding the mouth.

Origin:
1735–45

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Collins
World English Dictionary
sea anemone
 
n
See also actinia any of various anthozoan coelenterates, esp of the order Actiniaria, having a polypoid body with oral rings of tentacles

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sea anemone  
Any of numerous, often brightly colored cnidarians of the class Anthozoa, having flexible cylindrical bodies with tentacles surrounding a central mouth. Sea anemones are related to jellyfish and corals, but have no free-swimming (medusoid) stage, and resemble flowers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Sea anemone with tentacles extended for nighttime feeding.
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