paramecium (n.)youdaoicibaDictYouDict[paramecium 词源字典]
1752, Modern Latin Paramecium, the genus name, coined from Greek paramekes "oblong, oval," from para- "on one side" (see para- (1)) + mekos "length," related to makros "long" (see macro-).[paramecium etymology, paramecium origin, 英语词源]