Definitions

1. noun

A chamber that serves as the common opening for the reproductive, urinary, and digestive systems in many animal species, especially in invertebrates.

“In many invertebrates, the cloaca is a multi-purpose organ that performs various bodily functions.”

2. noun

A similar structure or chamber in some vertebrates, such as birds and reptiles, that serves as a common opening for the reproductive and urinary systems, but not the digestive system.

“In birds, the cloaca is a shared opening for the reproductive and urinary systems, but it is separate from the anus.”