ROCK n.
urope. (b) A North American sparrow (Pucæa ruficeps). -- Rock tar, petroleum. -- Rock thrush (Zoöl.), any Old World thrush of the genus Monticola, or Petrocossyphus; as, the European rock thrush (M. saxatilis), and the blue rock thrush of India (M. cyaneus), in which the male is blue throughout. -- Rock tripe (Bot.)…