Meanings (ES + gloss)
cloaca
The opening in reptiles, amphibians and birds, as well as elasmobranchians, lobe-finned fishes, and monotreme mammals, which serves as the common outlet for the urogenital ducts and rectum.
In birds the rectum, at the termination of its canal, forms an oval or elongated pouch […] and then expands into a cavity, which has been named cloaca.