clinker

n. stony matter; failure (Slang)

Clinker may refer to:Clinker (boat building), construction method for wooden boatsClinker (waste), waste from industrial processesClinker (cement), a kilned then quenched cement productClinker brick, rough dark coloured bricksClinker may also be used for:Small rocks that form in some ʻAʻā lava flowsWaste from coal fires
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Noun
1. a fragment of incombustible matter left after a wood or coal or charcoal fire
(synonym) cinder
(hypernym) fragment
2. a hard brick used as a paving stone
(synonym) clinker brick
(hypernym) brick
Verb
1. clear out the cinders and clinker from; "we clinkered the fire frequently"
(hypernym) clean out, clear out
2. turn to clinker or form clinker under excessive heat in burning
(hypernym) change
(derivation) cinder

n. clinker

(n.)
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.
  

(n.)
A scale of oxide of iron, formed in forging.
  

(n.)
A mass composed of several bricks run together by the action of the fire in the kiln.
  

(n.)
A kind of brick. See Dutch clinker, under Dutch.