1870, shortening of kilogram. Slang shortening key (in drug trafficking) is attested from 1968.
"one thousand grams," standard of mass in the metric system, 1797, from French kilogramme (1795); see kilo- + gram.
updated on July 26, 2012
英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。