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Webster's 1913 Dictionary

TRIMETHYL

TRIMETHYL Tri *meth "yl.

Defn: (Chem. ) A prefix or combining form (also used adjectively ) indicating the presence of three methyl groups.

TRIMETHYLAMINE

Tri *meth `yl *am "ine, n. Etym: [Trimethyl- + amine. ] (Chem. )

Defn: A colorless volatile alkaline liquid, N.(CH3 )3, obtained from herring brine, beet roots, etc. , with a characteristic herringlike odor. It is regarded as a substituted ammonia containing three methyl groups.

TRIMETHYLENE

TRIMETHYLENE Tri *meth "yl *ene, n. (Chem. )

Defn: A gaseous hydrocarbon, C3H6, isomeric with propylene and obtained from it indirectly. It is the base of a series of compounds analogous to the aromatic hydrocarbons.