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- (proscribed) plural of virus
- The plural virii, though common, is based on a misunderstanding of Latin. In classical Latin, virus appears to be a singulare tantum without any attested plural. If virus were a masculine 2nd declension noun, it would form its plural with a singular -i as viri. In fact as a neuter 2nd declension noun, in New Latin, the plural is formed as vira.
- Plural of virus on Wikipedia.Wikipedia