Clink"er (kl&ibreve;&nsm;k"&etilde;r), n. [From clink; cf. D. clinker a brick which is so hard that it makes a sonorous sound, from clinken to clink. Cf. Clinkstone.] 1. A mass composed of several bricks run together by the action of the fire in the kiln.

2. Scoria or vitrified incombustible matter, formed in a grate or furnace where anthracite coal in used; vitrified or burnt matter ejected from a volcano; slag.

3. A scale of oxide of iron, formed in forging.

4. A kind of brick. See Dutch clinker, under Dutch.

• Slag or ash produced by intense heat in a furnace, kiln or boiler that forms a hard residue upon cooling.
  
• Hardened volcanic lava.
  
• A scum of oxide of iron formed in forging.
  
• A very hard brick used for paving customarily made in Netherlands.
  
• A mass of bricks fused together by intense heat.
  
• One who clinks or an item that clinks, hence fetters are also called clinkers.
  
• Clink, derived from clinch, hence one who clinches or that clinches.
  
• Clinker-built, especially boats. Built by overlapping timber boards that are fixed by clinched nails.