1. [ adjective ] (geology) of or relating to the Carboniferous geologic era

"carboniferous rock system"

2. [ adjective ] relating to or consisting of or yielding carbon
Synonyms: carbonous carbonic carbonaceous
Related terms: carbon carbon carbon
3. [ noun ] (geology) from 280 million to 345 million years ago
Synonyms: Carboniferous_period
Related terms: period Paleozoic Mississippian Pennsylvanian
Similar spelling:   carbonaceous