Noun petromyzontidae has 1 sense
  1. Petromyzontidae, family Petromyzontidae - lampreys
    --1 is a kind of fish family
    --1 is a member of Cyclostomata, order Cyclostomata
    --1 has members:
     lamprey, lamprey eel, lamper eel; Petromyzon, genus Petromyzon
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