| 单词 | boulder |
| 释义 | Word Frequency boulder(ˈbəʊldə) noun 1. a smooth rounded mass of rock that has a diameter greater than 25cm and that has been shaped by erosion and transported by ice or water from its original position 2. geology a rock fragment with a diameter greater than 256 mm and thus bigger than a cobble Derived forms bouldery (ˈbouldery) adjective Word origin C13: probably of Scandinavian origin; compare Swedish dialect bullersten, from Old Swedish bulder rumbling + sten stone |
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