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

Science definitions for panthalassa

Panthalassa

[ păn′thə-lăsə ]

The ocean that surrounded the supercontinent Pangaea.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.