| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| erwinia | (noun) rod-shaped motile bacteria that attack plants | - |
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| gloxinia | (noun) any of several plants of the genera Gloxinia or Sinningia (greenhouse gloxinias) having showy bell-shaped flowers | - |
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| rhizoctinia | (noun) any fungus now or formerly belonging to the form genus Rhizoctinia | - |
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| sclerotinia | (noun) any fungus of the genus Sclerotinia; some causing brown rot diseases in plants | - |
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| ursinia | (noun) any of various plants of the genus Ursinia grown for their yellow- or orange- or white-rayed flowers | - |
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| vaccinia | (noun) a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox | Synonyms: cowpox |
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| (noun) a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar | Synonyms: vaccina, variola vaccina, variola vaccine, variola vaccinia |