Etymology
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enema (n.)

early 15c., via Medieval Latin, from Greek enema "injection," from enienai "to send in, inject," from en "in" (from PIE root *en "in") + hienai "to send, throw" (from PIE root *ye- "to throw, impel").

updated on May 11, 2017

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Definitions of enema from WordNet

enema (n.)
an injection of a liquid through the anus to stimulate evacuation; sometimes used for diagnostic purposes;
Synonyms: clyster
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.