Breathed in air or smoke through the nose or mouth into the lungs.
From Latin 'inhalare' combining 'in-' (in) and 'halare' (to breathe). The modern scientific term was formalized in the 17th century with the development of respiratory science.
Inhale and exhale are mirror words—literally in-breathing and ex-breathing! Medieval doctors didn't have these words; they just said 'breath in' until scientists made these fancy Latin terms.
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