What is "stopper bolt"

Stopper \Stop"per\, n.

1. One who stops, closes, shuts, or hinders; that which stops or obstructs; that which closes or fills a vent or hole in a vessel.

2. (Naut.) A short piece of rope having a knot at one or both ends, with a lanyard under the knot, -- used to secure something.
   --Totten.

3. (Bot.) A name to several trees of the genus Eugenia, found in Florida and the West Indies; as, the red stopper. See Eugenia.
   --C. S. Sargent.

   Ring stopper (Naut.), a short rope or chain passing through the anchor ring, to secure the anchor to the cathead.

   Stopper bolt (Naut.), a large ringbolt in a ship's deck, to which the deck stoppers are hooked.