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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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Merriam-Webster unabridgedWords at Play
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Time Traveler for sea oat
The first known use of sea oat was in 1879
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