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| | What's the Plural of `Virus'? |
 | | Not all Latin words ending in -us had plurals in -i. Apparatus, cantus, coitus, hiatus, impetus, Jesus, nexus, plexus, prospectus, and status were 4 |
 | | declension, with plurals corpora, genera, and opera. Virus is not attested in the plural in Latin, and is of a rare form (2 |
 | | declension neuter in -us) that makes it debatable what the Latin plural would have been; the only plural in English is viruses. Omnibus and rebus were not nominative nouns in Latin. Ignoramus was not a noun in Latin. |
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