Hypertext Webster Gateway: "counterterm"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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