Definition of "trimethyl" [tri•meth•yl]

• (in combination) Three methyl groups in a molecule. (noun)

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• "According to doping historian and physician Gary Wadler, the first documented fatality from a performance-enhancing drug came in 1886, when an English cyclist died from an overdose of "trimethyl" in a French race."
• "CAFFEINE, or THEINE (1.3.7 trimethyl 2.6 dioxypurin), C_8H_ {10} N_4O_2·H_2O,"
• "Its constitution is that of trimethyl-ethylene-hydrate-ammonic-hydrate, and has the following constitutional formula:"