Definitions

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

  • noun Any of a group of viruses that cause cancers in birds and mammals.

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

  • noun A virus that can cause cancer.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek onkos, mass, tumor; see oncology + virus.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From onco- +‎ virus.

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