plural lampreys
Definition of lamprey
: any of a family (Petromyzontidae) of eel-shaped freshwater or anadromous jawless fishes that include those cyclostomes having well-developed eyes and a large disk-shaped suctorial mouth armed with horny teeth
— called also lamprey eel
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Merriam-Webster unabridged
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Time Traveler for lamprey
The first known use of lamprey was in the 14th century
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