noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria.
2. 2
   large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America wordnet

Synonyms

All synonyms

animaldinosaurmammoth

Etymology

Ancient Greek πέλυξ (pélux, “bowl, axe”) and σαῦρος (saûros, “lizard”).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.