Webster's Revised Unabridged Dictionary · 1913

pelycosaur

pelycosaur , noun

1.

A large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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