What is Eyelet?

Eyelet definition and meaning on Dictionary terms:
a small hole, usually round and finished along the edge, as in cloth or leather for the passage of a lace or cord or as in embroidery for ornamental effect.
a lightweight fabric pierced by small holes finished with stitching and often laid out in flowerlike designs.
a metal ring for lining a small hole; grommet.
an eyehole in a wall, mask, etc.

Also oillet, oyelet, oylet. (in medieval architecture) a small aperture in a wall used as a window or loophole.
a small eye.

verb (used with object), eye