Age of invertebrates
Invertebrate In*ver"te*brate, a. (Zo["o]l.) 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]


The Collaborative International Dictionary of English. 2000.

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