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From The Collaborative International Dictionary of English v.0.48:
grommet \grom"met\ (gr[o^]m"m[e^]t), n. [F. gourmette curb, curb chain, fr. gourmer to curb, thump, beat; cf. Armor. gromm a curb, gromma to curb.] 1. A ring formed by twisting on itself a single strand of an unlaid rope. Sometimes written grummet. [1913 Webster] 2. Any eyelet or ring of metal or other material inserted in a hole in a sheet of some other material; in sailing, a metallic ring in or for a sail or a mailbag. [1913 Webster] 3. A ring of rubber or other insulating material inserted in a hole in some surface of a device, to prevent wires passing through the hole from making contact with the surface; used especially in electrical and electronic devices, to prevent undesired electrical contact. [PJC] 4. (Mil.) A ring of rope used as a wad to hold a cannon ball in place. [1913 Webster]