# Panthalassa

> English word · Proper noun

## Definitions
1. The prehistoric ocean surrounding Pangaea.

## Etymology
From pan- + Ancient Greek θάλασσα (thálassa, “sea”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/panthalassa