Source : Webster's Revised Unabridged Dictionary (1913)

Inhalant \In*hal"ant\, a. [Cf. F. inhalant.]
   Inhaling; used for inhaling.

Inhalant \In*hal"ant\, n.
   An apparatus also called an inhaler (which see); that which
   is to be inhaled.

Source : WordNet®

inhalant
     adj : used in or intended for inhaling; "available in oral or
           inhalant forms"
     n 1: something that is inhaled
     2: a medication to be taken by inhaling it [syn: {inhalation}]