Webster's English Dictionary

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amoeba

amoe.ba also amoe.ban \*-'me--b*\ \-(.)be-\ \-bik\ \-b*n\ n or amoebas or 
   amoebae [NL, genus name, fr. Gk amoibe- change, fr. ameibein to change -] 
   plm more at MIGRATE : any of a large genus (Amoeba) of naked rhizopod 
   protozoans with lobose and never anastomosing pseudopodia and without 
   permanent organelles or supporting structures that are widely distributed 
   in fresh and salt water and moist terrestrial situations; broadly : a naked 
   rhizopod or other amoeboid protozoan - amoe.bic aj