Webster's English Dictionary

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cloaca

clo.aca \klo--'a--k*\ \-.ke-, -.se-\ \-'a--k*l\ n or clo.acae [L; akin to 
   Gk klyzein to wash] [NL, fr. L] pl  1: SEWER  2: the common chamber into 
   which the intestinal, urinary, and generative ca nals discharge in birds, 
   reptiles, amphibians, and many fishes; also : a comparable chamber of an 
   invertebrate - clo.acal aj