Early 20th century; earliest use found in Journal of Geology. From German Ooid from ancient Greek ᾠοειδής egg-shaped from ᾠο- + -οειδής.
英语词典包含243303条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。