trimethylamine
noun(tri-meth-yl-amine)
an irritating gaseous or volatile liquid tertiary amine (CH3)3N that has a fishy odor, is only slightly more basic than ammonia, is flammable and forms explosive mixtures with air, is formed as a degradation product of many nitrogenous animal and plant substances, and is used chiefly in making quaternary ammonium compounds (as choline)