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    Rectum

    /ˈrɛk.təm/

    Meaning & Definition

    noun
    The final section of the large intestine, terminating at the anus.
    The doctor explained that the rectum is responsible for storing feces before elimination.
    A structure in certain invertebrate animals that serves a similar function as the rectum in mammals.
    In some species, the rectum also has a role in osmoregulation.
    A part of the alimentary canal in some lower organisms.
    The rectum of the earthworm plays a vital role in its digestion process.

    Etymology

    Late Latin, from 'rectus' meaning 'straight'.

    Common Phrases and Expressions

    rectal temperature:
    A measurement of body temperature taken from the rectum.
    rectal exam:
    A medical examination involving the rectum.
    rectal carcinoma:
    Cancer that occurs in the rectum.

    Related Words

    colon
    The part of the large intestine extending from the cecum to the rectum.
    anus
    The opening at the end of the digestive tract where solid waste leaves the body.
    sigmoid colon
    The part of the large intestine nearest to the rectum.

    Slang Meanings

    Backdoor
    He said he was going to sneak in through the backdoor.
    Brown eye
    They jokingly referred to it as the brown eye.