Differenze tra i sinonimi di "seno"

Petto is the most general and neutral term: it can refer to a man, a woman or an animal (petto di pollo = chicken breast). When in doubt, use this.

The general meaning of seno is that of any fold or cavity, so literally it would refer to the cleavage between a woman's two breasts. In practice, it is used to mean the whole bosom and, often albeit improperly, also to each of the two breasts.

These two words are perfectly polite and can be used in almost any context, medical or otherwise.

Tetta is the equivalent of “tit” or “boob”: each one of a woman's two breasts (so, mostly used in the plural tette). This word requires quite a bit of caution: depending on the context, it can be considered quite vulgar (one would never use it to politely describe a woman) or very intimate, but can also be more affectionate, especially when talking in a confidential context about babies and breast-feeding.