In Greek mythology, what is the name of the monster with a lion's head, a goat's body and a serpent's tail?

Chimera, in Greek mythology, a fire-breathing female monster resembling a lion in the forepart, a goat in the middle, and a serpent or dragon behind. She devastated Caria and Lycia until she was slain by Bellerophon.

In art the Chimera is usually represented as a lion with a goat’s head in the middle of its back and with a tail that ends in a snake’s head. This matches the description found in Hesiod’s Theogony (7th century BC). The word is now used generally to denote a fantastic idea or figment of the imagination.

The term Chimera has come to describe any mythical or fictional animal with parts taken from various animals, or to describe anything composed of very disparate parts, or perceived as wildly imaginative, implausible, or dazzling.

The sight of a Chimera was an omen for disaster.