Folded or rolled inward, as certain leaves and flowers.

【植】内旋的；内卷的(叶或花)。

Coiled spirally, as some shells.

螺旋状的；螺旋盘绕的(贝壳)。

Complicated; involved.

纷乱的；复杂的。

A curve traced by a point on a taut thread as it unwinds from, or winds upon, a fixed curve.

渐伸线。