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sauropterygian

[saw-rop-tuh-rij-ee-uh n]
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noun
  1. any of various Mesozoic marine reptiles of the superorder Sauropterygia, including the suborder Plesiosauria.
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adjective
  1. of or relating to a sauropterygian.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

sauropterygian in Science

sauropterygian

[sô-rŏp′tə-rĭjē-ən]
  1. Any of various extinct aquatic reptiles of the group Sauropterygia of the Mesozoic Era. Sauropterygians were carnivorous, had paddlelike limbs, and included the plesiosaurs. They were distantly related to the dinosaurs.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.