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Panthalassa

"universal sea," such as that which surrounded Pangaea, 1893 (Suess), from pan- "all" (see pan-) + Greek thalassa "sea," a word from a lost pre-Greek Mediterranean language.

Online Etymology Dictionary, © 2010 Douglas Harper
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panthalassa in Science
Panthalassa
  (pān'thə-lās'ə)   
The ocean that surrounded the supercontinent Pangaea.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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