an object of spiral or helical shape 螺旋形的物体 ■(Geometry)a surface formed by simultaneously moving a straight line along an axis and rotating it around it (like a screw thread) (几何)螺旋面
派生 helicoidal adjective 语源
late 17th cent.: from Greek helikoeidēs of 'spiral form', from helix, helik- (see helix)