Definition of cloaca
1
: sewer entry 3
2a
[New Latin, from Latin]
: the common chamber into which the intestinal and urogenital tracts discharge especially in monotreme mammals, birds, reptiles, amphibians, and elasmobranch fishes
also
: a comparable chamber of an invertebrate
b
: the enlarged terminal part of the posterior embryonic digestive tract of a mammal that gives rise to the rectum, upper anal canal, and urogenital sinus
3
: cesspool sense 2
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Merriam-Webster unabridged
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Time Traveler for cloaca
The first known use of cloaca was circa 1656
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