Definitions

1. adjective

relating to or resembling a cloaca, especially in the sense of having a shared opening for the urinary, reproductive, and digestive systems

“The embryonic chick has a cloacal membrane that eventually separates into the anus, urethra, and vagina.”

2. noun

a shared opening for the urinary, reproductive, and digestive systems, especially in animals such as birds and reptiles

“The cloacal opening is a common feature among many species of birds and reptiles.”