'blunt-fruited' is a compound formed from the adjective 'blunt' + the adjective-form 'fruited' (from 'fruit'). 'blunt' comes from Middle English 'blunt'/'blont' (via Old French 'blund') meaning 'dull, rounded', and 'fruit' comes from Old French 'fruit', from Latin 'fructus' meaning 'enjoyment, produce'.

'blunt' developed in Middle English from Old French 'blund' (meaning 'dull, blunt, rounded'), while 'fruited' is formed in Modern English by adding the participial/adjectival suffix '-ed' to 'fruit'; together they were combined in botanical contexts to describe the shape of a plant's fruit.

Initially, 'blunt' meant 'dull' or 'not sharp' and 'fruit' meant 'produce' or 'yield'; over time the compound came to be used specifically in botanical descriptions to mean 'bearing blunt or rounded fruit'.