A patch or change that fixes the unwanted behaviour exhibited by a bug.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "bugfix" in a sentence
"Even though the writing is a little rough in places, and will be seriously reworked before I do the audio version which I'm thinking of as a "bugfix" release."
"Also, it would be interesting which version of Magento you evaluated, since the core code is very actively maintained (osCommerce: last core release (bugfix only) on the 30th Jan 08)."
"WordPress 2.2.2 and 2.0.11 security and bugfix releases"