<p><strong>Noun:</strong></p><ul><li>Any of various rings or eyelets of metal or the like.</li><li>An insulated washer of rubber or plastic, inserted in a hole in a metal part to prevent grounding of a wire passing through the hole.</li><li>Nautical: a ring or strop of fiber or wire; becket.</li><li>A ring having a thickness of three strands, made by forming a loop of a single strand, then laying the ends around the loop.</li><li>A ring of fiber used as a seal or gasket, as under the head of a bolt.</li><li>A washer or packing for sealing joints between sections of pipe.</li><li>Military: a stiff ring of rubber or metal inside the top of a service cap, designed to keep the top of the cap stretched flat.</li><li>A metal-bound eyelet in cloth, sometimes used decoratively, as on a garment.</li></ul><p><strong>Verb:</strong></p><ul><li>(Used with object) To fasten with a grommet.</li></ul>