Definition of lobster
1
: any of a family (Nephropidae and especially Homarus americanus) of large edible marine decapod crustaceans that have stalked eyes, a pair of large claws, and a long abdomen and that include species from coasts on both sides of the North Atlantic and from the Cape of Good Hope
2
: spiny lobster
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Merriam-Webster unabridged
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Time Traveler for lobster
The first known use of lobster was before the 12th century
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