rectum - Dictionary definition and pronunciation - Yahoo! Education
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rec·tum  audio  (rktm) KEY 

NOUN:
pl. rec·tums or rec·ta  (-t) KEY 
The terminal portion of the large intestine, extending from the sigmoid colon to the anal canal.
ETYMOLOGY:
Middle English, from Latin (intestnum) rctum, straight (intestine), neuter of rctus; see reg- in Indo-European roots


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