Definition of amoeba noun from the Oxford Advanced Learner's Dictionary

 

amoeba

 noun
(also US English ameba)noun
BrE BrE//əˈmiːbə//
 
; NAmE NAmE//əˈmiːbə//
 
(pl. amoebas, amoebae
BrE BrE//əˈmiːbiː//
 
; NAmE NAmE//əˈmiːbiː//
 
)
 
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a very small living creature that consists of only one cell Word Origin mid 19th cent.: modern Latin, from Greek amoibē ‘change, alternation’.
See the Oxford Advanced American Dictionary entry: amoeba