Noun crawdad has 2 senses
  1. crayfish, crawfish, crawdad, ecrevisse - tiny lobster-like crustaceans usually boiled briefly
    --1 is a kind of shellfish
    --1 is a part of American crayfish; Old World crayfish, ecrevisse
  2. crayfish, crawfish, crawdad, crawdaddy - small freshwater decapod crustacean that resembles a lobster
    --2 is a kind of decapod crustacean, decapod
    --2 is a member of Astacidae, family Astacidae, Astacura
    --2 has particulars: Old World crayfish, ecrevisse; American crayfish
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