Definition of Permo-Pennsylvanian in English:

Permo-Pennsylvanian

Pronunciation /ˌpəːməʊˌpɛns(ɪ)lˈveɪnɪən/

noun

Geology
  • The late Pennsylvanian and early Permian systems or periods considered jointly.

    The equivalent in the United States of Permo-Carboniferous.

adjective

Geology
  • Of or relating to the Permo-Pennsylvanian.

Origin

Early 20th century; earliest use found in The Botanical Gazette. From Perm- + -o- + Pennsylvanian.