Definition of "quasispecies" []

• A group of organisms once (but no longer) thought to be a separate species (and sometimes given such a name) (noun)
• A group of similar nucleic acid molecules; a group of viruses having such similar genomes (noun)

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• "This ensemble of closely related RNAs is called a quasispecies."
• "HIV-1 operates as a 'quasispecies', that is, a large population of genetically distinct, yet related organisms."
• "It is easy to see why the idea of the quasispecies, a grouping of slightly different but related RNA molecules, is so powerful."