n. A small aperture; specifically, a small round hole worked round the edge like a buttonhole, used in dressmaking, sailmaking, and the like. Also eyelet-hole.n. A metallic ring designed to be placed in a perforation called an eyelet-hole, in cloth, leather, etc., for the passage of a lace, cord, or small rope; also, a similar ring used for fastening together sheets of paper, etc.n. In entomology: A small eye or ocellate spot; a small spot with a central dot of another color.n. An ocellus or simple eye.To furnish or fasten with an eyelet.