Etymology
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paramecium (n.)

"genus of holotrichous ciliate Infusorial" [OED]; "the slipper-animacule" [Century Dictionary]; 1752, Modern Latin Paramecium, the genus name, coined from Greek paramekes "oblong, oval," from para- "on one side" (see para- (1)) + mēkos "length," related to makros "long," from PIE root *mak- "long, thin."

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Definitions of paramecium

paramecium (n.)
any member of the genus Paramecium;
Synonyms: paramecia
From wordnet.princeton.edu