'agranulocytosis' originates from Greek, specifically the word 'granulocytos,' where 'a-' meant 'without,' 'granulo-' referred to 'granule,' and 'cytos' meant 'cell.'

'granulocytos' transformed into the modern English word 'agranulocytosis' through medical terminology development.

Initially, it meant 'without granulocytes,' and this meaning has largely remained the same in modern usage.