'angiospermy' originates from New Latin and ultimately from Greek, specifically the elements 'angio-' from Greek 'angeion', where 'angeion' meant 'vessel', and 'sperma' where 'sperma' meant 'seed'.

'angiospermy' changed from the modern English term 'angiosperm' by adding the noun-forming suffix '-y' to denote the state or condition, and eventually became the modern English word 'angiospermy'.

Initially, it meant 'seed in a vessel' (from the original component meanings), but over time it evolved into its current meaning of 'the condition or quality of being an angiosperm (a flowering plant)'.