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paramecium

par·a·me·ci·um [ pàrrə mshee əm, pàrrə mssee əm ] (plural par·a·me·ci·a [ pàrrə mshee ə, pàrrə mssee ə ] or par·a·me·ci·ums)


noun 
Definition:
 
microscopic water organism: a single-celled microscopic organism protozoan with fine appendages cilia around its body that it uses to move around in water and to capture bacteria. Genus Paramecium.

[Mid-18th century. < modern Latin< Greek paramēkēs "oval"; from its shape]
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