an object having a three-dimensional shape like that of a wire wound uniformly in a single layer around a cylinder or cone, as in a corkscrew or spiral staircase
螺旋,螺旋状物。
【几何】 螺旋线。
【生化】 螺旋形链。
【建筑】 螺旋饰。
【剖】 耳轮。
" mid 16th cent. (in the architectural sense ‘spiral ornament’): via Latin from Greek."