ōˈsirəwē noun
Usage: capitalized
Etymology: New Latin, from Greek ōkyroēs swift-flowing, from ōkys swift + -roēs (akin to rhein to flow) — more at stream
: a genus (coextensive with the family Ocyroidae) of ctenophores of the Gulf of Mexico and the Caribbean sea that swim by means of a large winglike process on each side of the body