\De*vo"ni*an\, a. (Geol.)
Of or pertaining to Devon or Devonshire in England; as, the
Devonian rocks, period, or system.
{Devonian age} (Geol.), the age next older than the
   Carboniferous and later than the Silurian; -- called also
   the {Age of fishes}. The various strata of this age
   compose the Devonian formation or system, and include the
   old red sandstone of Great Britain. They contain, besides
   plants and numerous invertebrates, the bony portions of
   many large and remarkable fishes of extinct groups. See
   the Diagram under {Geology}.

\De*vo"ni*an\, n.
The Devonian age or formation.