Wart: N. A Small, {crock}y {feature} That Sticks Out Of An Otherwise {clean} Design.

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:wart: n. A small, {crock}y {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 {miswart}.
-- The AI Hackers Dictionary