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Noun: Software originally designed to be hostile, disruptive or destructive but which also serves a useful function, to the net benefit of the user.

Alternate variant: Hostile software which has been adapted to benefit the end user without completely deactivating the destructive features.
1: That download program keeps sending out spam email, but it's blazing fast, I guess it's a symbyte.

2: My computer got a new virus last week. I tweaked it's code and now it still messes up the time and date on my computer but it also stops spyware: overall, it's a symbyte.

by The blind left-handed abbot February 10, 2007
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