Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
geological period | Yes | No | No | No |
Devonian | Yes | No | No | No |
geological period (noun) | Devonian (noun) |
---|---|
a unit of geological time during which a system of rocks formed | the period from 405 million to 345 million years ago; characterized by preponderance of fishes and appearance of amphibians and ammonites |