The Collaborative International Dictionary
Trimethyl
Trimethyl \Tri*meth"yl\ (Chem.) A prefix or combining form (also used adjectively) indicating the presence of three methyl groups.
Wiktionary
trimethyl
n. (context organic chemistry English) (''in combination'') Three methyl groups in a molecule.
Usage examples of "trimethyl".
AZD followed by a trimethyl concentrate chaser, with maybe a quick snort of snow as the capper.
It is four-chloryl, four-hydroxy, trimethyl, six-fluorodimethyl carbamate.