Defn: Of or pertaining to a trimester, or period of three months; occurring once in every three months; quarterly.
TRIMETER Trim"e*ter, a. Etym: [L. trimetrus, Gr. Tri-) + measure. See Meter measure.] (Pros.)
Defn: Consisting of three poetical measures.
— n.
Defn: A poetical division of verse, consisting of three measures.
Lowth.
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
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.