'allergist' originates from the Greek word 'allergia,' where 'allos' meant 'other' and 'ergon' meant 'work.'

'allergia' transformed into the French word 'allergie,' and eventually became the modern English word 'allergy,' from which 'allergist' is derived.

Initially, it meant 'reaction to other substances,' and over time it evolved into its current meaning of 'specialist in allergies.'