[oh-beel-yuh, oh-bee-lee-uh]
a colonial hydroid of the genus Obelia, common in temperate seas and appearing as a delicate, mosslike growth on rocks, pilings, etc.

1865–70; < Neo-Latin < Greek obelías a loaf toasted on a spit, equivalent to obel(ós) a spit (see obelisk) + -ias noun suffix

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