An isomer of pentane which is an easily condensable gas found in small amounts in petroleum; dimethylpropane, C(CH₃)₄.
Late 19th century; earliest use found in William Odling (1829–1921), chemist.
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。