Definition of sea oat
1 : a tall grass (Uniola paniculata) that has panicles resembling those of the oat, grows on the coast of the southern U.S., and is useful as a sand binder —usually used in plural
2 sea oats plural : a cluster of yellowish vase-shaped egg cases of a whelk of the genus Thais : sea corn
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First Known Use of sea oat
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