'rounded-lobed' originates from the combination of 'rounded' and 'lobed', where 'rounded' means 'having a smooth, curved surface' and 'lobed' refers to 'having lobes'.

'rounded-lobed' combines the Middle English word 'round' from Old French 'rond' and the word 'lobed' from the Latin 'lobus', eventually forming the modern English term 'rounded-lobed'.

Initially, it described any rounded shape, but over time it evolved to specifically refer to rounded lobes, especially in botanical contexts.