'Age of invertebrates' definitions:

Definition of 'Age of invertebrates'

From: GCIDE
  • Invertebrate \In*ver"te*brate\, a. (Zool.) Destitute of a backbone; having no vertebr[ae]; of or pertaining to the Invertebrata. -- n. One of the Invertebrata. [1913 Webster]
  • Age of invertebrates. See Age, and Silurian. [1913 Webster]