Noun subclass synapsida has 1 sense
  1. Synapsida, subclass Synapsida - extinct reptiles of the Permian to Jurassic considered ancestral to mammals
    --1 is a kind of class
    --1 is a member of Reptilia, class Reptilia
    --1 has members:
     Therapsida, order Therapsida; Ictodosauria, order Ictodosauria; Pelycosauria, order Pelycosauria
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