Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of a group of viruses whose nucleic acid core is composed of RNA, including the retroviruses and picornaviruses.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of many viruses that possess ribonucleic acid as their genetic material and do not replicate using DNA

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