Noun tethyidae has 1 sense
  1. Aplysiidae, family Aplysiidae, Tethyidae, family Tethyidae - sea hares
    --1 is a kind of mollusk family
    --1 is a member of Nudibranchia, order Nudibranchia
    --1 has members: Aplysia, genus Aplysia, Tethys, genus Tethus
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