丸型

(1)ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point; "he calculated the circumference of the circle"

(2)2本の軸が等しい長さである楕円

(3)固定した1点から一定の距離で動く1点の作る平面曲線

(4)any circular or rotating mechanism; "the machine punched out metal circles"

(5)循環機構あるいは回転機構のいずれか

(1)