wart

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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 obtaining ASCII characters in a foreign environment is a wart. See also miswart.