Hypertext Webster Gateway: "irrespirable"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Irrespirable \Ir*res"pi*ra*ble\, a. [L. irrespirabilis: cf. F.
irrespirable. See {Respirable}.]
Unfit for respiration; not having the qualities necessary to
support animal life; as, irrespirable air.
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