methane (n.)youdaoicibaDictYouDict
"inflammable colorless and odorless gas, marsh gas," 1867, coined from chemical suffix -ane + syllable abstracted from methyl.
sarin (n.)youdaoicibaDictYouDict
type of odorless nerve gas, 1945, from German, but the name is of unknown origin. Other phosphorous compounds known in Germany by the end of World War II were called Tabun, soman, Diglykol.