topcoat

noun

1. A light overcoat (outer garment).

   “Our new acquaintance very deliberately coiled up the tube of his hookah, and produced from behind a curtain a very long befrogged topcoat with Astrakhan collar and cuffs.”

   “He is wearing a black armband on the left sleeve of his gray topcoat.”

   “Whereas Oehler habitually wears his topcoat completely buttoned up, I leave my topcoat completely open.”

   “Then he opened his closet and took out a black topcoat. It was heavily lined with silk, soft to the touch.”

2. A layer of paint or varnish etc. applied after the undercoat.

   “Near-synonym: overcoat”

   “Apply two topcoats, particularly to areas that are fully exposed to the weather such as the south side of the house. A total of three coats (primer and two topcoats) should result in an optimum thickness of 4-1/2 to 5 mils.”

   “Fig. 7 shows the microstructures of lutetium silicate topcoat on SiC/SiC composite after various exposure tests.”

   “Without the protection of the topcoat, your wood constantly expands and contracts and is more susceptible to warping and cracking. Topcoats also improve the look of the wood by adding depth and color.”

verb

1. (transitive)To apply a topcoat to (something).