A plutonic rock, typically coarse-grained and found especially in dykes, consisting chiefly of corundum grains in an oligoclase matrix.
Early 20th century. From the name of Plumas County, California, where it was first found + -ite.
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。