Each of three isomeric carboxylic acids derived from resorcinol, used as intermediates in the manufacture of dyestuffs and drugs.
Late 19th century; earliest use found in Edgar Fahs Smith (1854–1928).
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。