1620s, "a breathing in," noun of action from past participle stem of Latin inhalare "breathe upon" (used here as if it meant "to breathe in"), from in- "on, upon" (from PIE root *en "in") + halare "breathe."
Ingvaeonic
inhabit
inhabitable
inhabitant
inhalant
inhalation
inhale
inhance
inharmonious
inhere
inherence