bioregion

noun bio·re·gion \ˈbī-ō-ˌrē-jən\

Definition of BIOREGION

: a region whose limits are naturally defined by topographic and biological features (as mountain ranges and ecosystems)

— bio·re·gion·al \ˌbī-ō-ˈrēj-nəl, -ˈrē-jə-n^əl\ adjective

1978

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