\Bu*tyr"ic\, a. (Chem.)
Pertaining to, or derived from, butter.
{Butyric acid}, {C3H7.CO2H}, an acid found in butter; an
   oily, limpid fluid, having the smell of rancid butter, and
   an acrid taste, with a sweetish aftertaste, like that of
   ether. There are two metameric butyric acids, called in
   distinction the normal- and iso-butyric acid. The normal
   butyric acid is the one common in rancid butter.