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"Obelia" Definition

noun

Any of various colonial marine hydroids of the genus Obelia, having various specialized feeding and reproductive polyps and growing in a branchlike form. Colonies of obelia are found as a delicate furlike growth on the wooden piles of piers and wharves.

Source: American Heritage Dictionary

Any of a genus () of small colonial marine hydroids with colonies branched like trees.

Source: Merriam-Webster