actinaria

from The Century Dictionary.

• The flesh-corals, a suborder of Anthozoa, usually with 6 (or a multiple of 6) simple tentacles and no skeleton. It includes Actinia, Adamsia, Cerianthus, and other genera.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An order of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun sea anemones