'Counterterm' definitions:

Definition of 'Counterterm'

From: GCIDE

Counterterm \Coun"ter*term`\ (-t?rm`), n. A term or word which is the opposite of, or antithesis to, another; an antonym; -- the opposite of synonym; as, "foe" is the counterterm of "friend". --C. J. Smith. [1913 Webster]