a. | 1. | (Geol.) Of or pertaining to Devon or Devonshire in England;
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n. | 1. | The Devonian age or formation. |
Noun | 1. | Devonian - from 405 million to 345 million years ago; dominance of fishes and appearance of amphibians and ammonites Synonyms: Age of Fishes, Devonian period |