roundness 的詞源
roundness(n.)
"圓形或圓形狀態",14世紀晚期,來自 round(形容詞)+ -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 同樣適用於圓形、球體、圓柱體或圓錐體,通過擴展,也適用於通過接近暗示任何一個形狀的形式:如肢體或面頰的 roundness。 Rotundity 現在通常適用於球體和暗示球體或半球體的形式:如地球或桶的 rotundity; 腹部的 rotundity。[世紀詞典]
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roundness 的趨勢
根據books.google.com/ngrams/調整。Ngrams可能不可靠。
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