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cloaca (n.)

1650s, euphemism for "underground sewer," from Latin cloaca "public sewer, drain," from cluere "to cleanse," probably from PIE root *kleu- "to wash, clean" (source also of Greek klyzein "to dash over, wash off, rinse out," klysma "liquid used in a washing;" Lithuanian šluoju, šluoti "to sweep;" Old English hlutor, Gothic hlutrs, Old High German hlutar, German lauter "pure, clear"). Use in biology, in reference to eliminatory systems of lower animals, is from 1834. Related: Cloacal (1650s); cloacinal (1857).

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Definitions of cloaca

cloaca (n.)
(zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open;
cloaca (n.)
a waste pipe that carries away sewage or surface water;
Synonyms: sewer / sewerage
From wordnet.princeton.edu