'smooth-fruited' originates from the combination of 'smooth' and 'fruit,' where 'smooth' meant 'having an even and regular surface' and 'fruit' referred to the seed-bearing structure in flowering plants.

'smooth' and 'fruit' have been used in English since the Middle Ages, and the combination 'smooth-fruited' likely emerged in botanical contexts to describe specific plant characteristics.

Initially, it meant 'having a smooth surface on the fruit,' and this meaning has remained consistent in modern usage.