sealant

(sēlənt)

noun

a substance, as a wax, plastic, silicone, etc., used for sealing

Origin: seal + -ant

See sealant in American Heritage Dictionary 4

noun
  1. A substance, such as sealing wax, used to seal a surface to prevent passage of a liquid or gas.
  2. A plastic resin used in dentistry to coat the chewing surfaces of the back teeth to prevent the growth of cavity-causing bacteria.

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