D defs.my
Entry 4 senses Webster, 1913

grommet

/(grŏm"mĕt)/ · grom·met · IPA /ˈɡɹɑ.mɪt/
01 n. A ring formed by twisting on itself a single strand of an unlaid rope. Sometimes written grummet.
  1. 1.
    A ring formed by twisting on itself a single strand of an unlaid rope. Sometimes written grummet.
  2. 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.
  3. 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.
  4. 4.
    A ring of rope used as a wad to hold a cannon ball in place.(Mil.)