dropstone

词形变化

dropstones 复数 dropstones

释义与例句

n.
  1. 1.

    An isolated fragment of rock found within a sedimentary rock (that had fallen, rather than being carried along).

    地质
  2. 2.

    An isolated rock that is geologically distinct from the surroundings, indicating that it was carried from a distant area and then dropped in place (by a melting glacier); an erratic.

词源

From drop + stone.

来源：wiktionary