'angustifolious' originates from New Latin, specifically the compound 'angustifolius,' where 'angusti-' meant 'narrow' and '-folius' (from 'folium') meant 'leaf; -leaved.'

'angustifolious' changed from the New Latin botanical term 'angustifolius' and eventually became the modern English word 'angustifolious'.

Initially, it meant 'narrow-leaved (in botany)', and this meaning has largely remained the same in modern usage.