Origin: L. Inhalare to breathe upon; pref. In- in _ halare to breathe: cf. F. Inhaler. Cf. Exhale. Draw deep into the lungs in by breathing; Clinton smoked marijuana but never inhaled.Draw in (air); Inhale deeply; inhale the fresh mountain air; The patient has trouble inspiring; The lung cancer patient cannot inspire air very well.The action involving the intake of gases via [[breathing.