What does the word clinker mean?

Usage examples for clinker

  1. A short trolley line ran down a stone pier from beside the road to the edge of the water, where a barge with a bright brown sail waited; the smoke from a clinker fire built in a pierced bucket swept fitfully about the pier; grimy men loaded a car on the trolley line. – Highways and Byways in Surrey by Eric Parker
  2. She was a clinker- built boat, about seventeen feet long, and her breadth of beam- that is, the distance across her from one side to the other- was great compared with her length. – Frank, the Young Naturalist by Harry Castlemon