Definition of grampus
1a
: risso's dolphin
b
: any of various other small cetaceans (such as the killer whale or pilot whale)
2
: the giant whip scorpion (Mastigoproctus giganteus) of the southern U.S.
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Merriam-Webster unabridged
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Time Traveler for grampus
The first known use of grampus was circa 1529
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