a very large rock which has been shaped by water or the weather （受水或天气侵蚀而成的）巨石；漂砾 
huge granite boulders underneath the cliff 悬崖下的巨大花岗岩巨石 fallen rocks and boulders 倒下的岩石和巨石 As the ice sheet rode over the land, huge boulders were ripped from the underlying rock. 冰盖划过地面时，从地表下面的岩石上撕下来一些巨石块。
Word Originlate Middle English: shortened from earlier boulderstone, of Scandinavian origin.
