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The Free On-line Dictionary of Computing (foldoc)

Any construct that acts to produce copies of itself; this
could be a living organism, an idea (see {meme}), a program
(see {quine}, {worm}, {wabbit}, {fork bomb}, and {virus}), a
pattern in a {cellular automaton} (see {life}), or
(speculatively) a robot or {nanobot}. It is even claimed by
some that {Unix} and {C} are the symbiotic halves of an
extremely successful replicator; see {Unix conspiracy}.

[{Jargon File}]