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Webster's Dictionary (1865)

Rŭb'ble-stōne, n.

noun

n. 1. (Mining.) Rubble. See RUBBLE.

  1. Small stones used for coarse masonry; rubble.
  2. (Geol.) A kind of conglomerate rock composed of fragments of different kinds of rock cemented together by some substance, and usually called graywacke. Kirwan.