'angiosperm-related' originates from Modern English, formed by compounding 'angiosperm' + 'related', where 'angiosperm' ultimately comes from Neo-Latin 'Angiospermae' and Greek roots 'angeion' meaning 'vessel' and 'sperma' meaning 'seed'.

'angiosperm' was coined from Neo-Latin 'Angiospermae' in the 19th century (from Greek components), became the English noun 'angiosperm', and in Modern English was combined with the adjective-forming element 'related' to create the compound 'angiosperm-related'.

Initially the Greek-based element meant 'vessel-seed' (emphasizing seeds enclosed in a vessel), which evolved into the botanical term 'angiosperm' meaning 'flowering plant'; 'angiosperm-related' consequently came to mean 'related to flowering plants'.