A stone or concretion found in the stomach; specifically a stone swallowed by an animal as an aid to balance or digestion.
Late 17th century; earliest use found in Nehemiah Grew (a1641–1712), botanist and physician.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。