What does guinea pig mean in latin?

Porcellino d'India is an Italian equivalent of 'guinea pig' in terms of the mammal. The masculine noun 'porcellino'means 'piglet'. The preposition 'di'* means 'of, from'. All together, they're pronounced 'pohr-chehl-LEE-noh DEEN-dyah'.

Cavia is an equivalent, in the sense of the experimental 'guinea pig' to someone or something. It's a feminine noun whose definite article is 'la' ['the'], and whose indefinite article is 'una' ['a, one']. It's pronounced 'KAH-vee-ah'.

*The vowel 'i' of 'di' drops before a noun that begins with a vowel. The temporary nature of the drop is indicated by an apostrophe: 'd'India'.