Definitions

1. adjective

Having or pertaining to a methyl group (CH₃) attached to three other atoms or groups.

“Trimethyl phosphate is a widely used reagent in organic synthesis.”

2. noun

A compound consisting of three methyl groups attached to a central atom or group.

“Trimethyl aluminum is a common catalyst in polymerization reactions.”

3. adverb

In a manner that involves or adds three methyl groups.

“The trimethyl process is a complex method used to synthesize certain organic compounds.”