Wrinkle

A winkle.

A small ridge, prominence, or furrow formed by the shrinking or contraction of any smooth substance; a corrugation; a crease; a slight fold; as, wrinkle in the skin; a wrinkle in cloth.

hence, any roughness; unevenness.

A notion or fancy; a whim; as, to have a new wrinkle.

To contract into furrows and prominences; to make a wrinkle or wrinkles in; to corrugate; as, wrinkle the skin or the brow.

Hence, to make rough or uneven in any way.

To shrink into furrows and ridges.

a minor difficulty; "they finally have the wrinkles pretty well ironed out"