A semantic Paradox, also called the Heterological Paradox, which arises by defining ``heterological'' to mean ``a word which does not describe itself.'' The word ``heterological'' is therefore heterological Iff it is not.
See also Russell's Paradox
References
Hofstadter, D. R. Gödel, Escher, Bach: An Eternal Golden Braid. New York: Vintage Books, pp. 20-21, 1989.