roundness的词源解释,roundness来源

"圆形或圆形状态"，14世纪晚期，来自 round（形容词）+ -ness。

Roundness applies with equal freedom to a circle, a sphere, a cylinder, or a cone, and, by extension, to forms that by approach suggest any one of these : as, roundness of limb or cheek. Rotundity now applies usually to spheres and to forms suggesting a sphere or a hemisphere : as, the rotundity of the earth or of a barrel ; rotundity of abdomen. [Century Dictionary]

Roundness 同样适用于圆形、球体、圆柱体或圆锥体，通过扩展，也适用于通过接近暗示任何一个形状的形式：如肢体或面颊的 roundness。 Rotundity 现在通常适用于球体和暗示球体或半球体的形式：如地球或桶的 rotundity； 腹部的 rotundity。[世纪词典]

该词起源时间：14世纪末