o·be·lia ( -b l y )n. 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. [New Latin Obelia, genus name, probably from Greek obeli  s, a loaf baked on a spit, from obelos, a spit.] |
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