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The Collaborative International Dictionary
Neogaean

Neogaean \Ne`o*g[ae]"an\ (n[=e]`[-o]*j[=e]"an), a. [Neo- + Gr. gai^a earth.] (Zo["o]l.) Of or pertaining to the New World, or Western Hemisphere.

Wiktionary
neogaean

a. (context zoology English) Of or relating to the New World, or Western Hemisphere.