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Webster 1913 Edition

Adj.

[L.

inexterminabilis

. See

not, and

Incapable of extermination.

Rush.

Adj.

[in and exterminable.]

That cannot be exterminated.

inexterminable ‎(comparative more inexterminable, superlative most inexterminable)

Impossible to exterminate.
(Can we find and add a quotation of Rush to this entry?)