Definition of Permo–Triassic in English:

Permo–Triassic

Syllabification: Per·mo–Tri·as·sic
Pronunciation: /ˌpərmō ˌtrīˈasik
 
/

adjective

Geology
1Of, relating to, or occurring at the boundary of the Permian and Triassic periods, about 245 million years ago. Mass extinctions occurred at this time, marking the end of the era.
1.1Of or relating to the Permian and Triassic periods or rock systems considered as a unit.
1.2 (as noun the Permo–Triassic or Permo–Trias) The Permian and Triassic periods together or the system of rocks deposited during them.

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