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Noun: synapsid
  1. Extinct reptile-like animal having a single pair of temporal fenestrae in the skull; ancestral to mammals
    "Synapsids dominated terrestrial ecosystems before the rise of the dinosaurs"; "Dimetrodon was a prominent synapsid reptile of the Permian period";
    - synapsid reptile

Derived forms: synapsids

Type of: reptile, reptilian

Encyclopedia: Synapsid