'grassy' originates from Old English, specifically the word 'græs' plus the adjectival suffix '-ig' (later '-y'), where 'græs' meant 'grass' and '-ig' meant 'having the quality of'.

'grassy' changed from Old English 'græsig' through Middle English forms such as 'grasig'/'grasy' and eventually became the modern English word 'grassy'.

Initially it meant 'having or full of grass', and over time it has retained that basic meaning while also extending to describe grass-like flavors or aromas.