Putto best-known are the sculptor Donatello and the painter Raphael. The two relaxed and curious putti who appear at the foot of Raphael's Sistine Madonna are often reproduced. They also experienced a major revival in the 19th century, where they gamboled through paintings by French academic painters, from Gustave Doré’s illustrations for "Orlando Furioso" to advertisements. The iconography of putti is deliberately unfixed, so that it is difficult to tell the difference between putti, cupids, and various forms of angels. They have no unique, immediately identifiable attributes, so that putti may have many meanings and roles in the context of art.
Plural form of words ending in -us meaning "venom" or "rust" and the Sanskrit word ' meaning "toxic, poison". Since "vīrus" in antiquity denoted something uncountable, it was a mass noun. Mass nouns pluralize only under special circumstances, hence the non-existence of plural forms in the texts. There is no known plural for this word in Classical Latin. It is unclear how a plural might have been formed under Latin grammar in ancient times if the word had acquired a meaning requiring a plural form. In Latin, "vīrus" is generally regarded as a neuter of the second declension, but neuter second declension nouns ending in "-us" (rather