'agamospermous' originates from Greek via New Latin: from Greek elements 'a-' meaning 'without', 'gamos' meaning 'marriage' or 'union', and 'sperma' meaning 'seed', combined in New Latin 'agamospermy' with the English adjectival suffix '-ous'.

'agamospermous' developed from New Latin 'agamospermia'/'agamospermy' (constructed in modern botanical Latin) and was adopted into English botanical usage as 'agamospermous' by adding the adjectival suffix '-ous'.

Initially formed to describe the condition 'without sexual union for seed formation', it has come to mean specifically 'producing seeds without fertilization' in modern botanical usage.