Wart N. A Small, Crocky Feature That Sticks Out Of An Otherwise Clean Design.

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wart n.

A small, crocky feature that sticks out
of an otherwise clean design. Something conspicuous for
localized ugliness, especially a special-case exception to a
general rule. For example, in some versions of csh(1),
single quotes literalize every character inside them except
!. In ANSI C, the ?? syntax used for obtaining ASCII
characters in a foreign environment is a wart. See also