'Age of invertebrates' definitions:
Definition of 'Age of invertebrates'
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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]
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Age of invertebrates. See Age, and Silurian.
[1913 Webster]