Definition of Panthalassa in English:

Panthalassa

Syllabification: Pan·thal·as·sa
Pronunciation: /ˌpanTHəˈlasə
 
/
A universal sea or single ocean, such as would have surrounded Pangaea.

Origin

late 19th century: from pan- 'all' + Greek thalassa 'sea'.

Definition of Panthalassa in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up