A small, crocky feature that sticks out of an otherwise clean design. Something conspicuous for localised ugliness, especially a special-case exception to a general rule. For example, in some versions of "csh(1)", single quotes literalise 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.
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Nearby terms: warm boot « Warm Silence Software « Warp « wart » washing machine » Wasserman » WATBOL