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What is a clast?

What is a clast? Here are some definitions.

Noun
  1. (geology) a fragment of rock that was broken from a larger rock or rock unit.
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Examples
A very few clast imbrications at Robins show transport from the north, suggesting that transport directions are also unchanged.
Graded bedding, in which size decreases from bottom to top, is common: because agitated waters rarely subside at once, declining transport power causes a gradual upward decrease in maximum clast size.
A terminal grade is the smallest grain size to which an entrained clast may be reduced by crushing and abrasion under a glacier.
Clast lithology map showing contoured percentages of Archean granitoid pebbles in till.
In one class of breccia, clast material, breccia formation, and cement are all closely related in time.
A large, angular semi-pelite clast contains two tectonic fabrics, one of which is parallel to bedding within the clast whereas the other is oblique to it.

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