Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of helianthoidea is as below...

Helianthoidea :: Helianthoidea (n. pl.) An order of Anthozoa; the Actinaria.

Helianthoid :: Helianthoid (a.) Of or pertaining to the Helianthoidea.

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