Akademik

Pennsylvanian period
noun
from 310 million to 280 million years ago; warm climate; swampy land
Syn: ↑Pennsylvanian, ↑Upper Carboniferous, ↑Upper Carboniferous period
Instance Hypernyms: ↑period, ↑geological period
Part Holonyms: ↑Carboniferous, ↑Carboniferous period

Useful english dictionary. 2012.