Source : Webster's Revised Unabridged Dictionary (1913)

Amoeba \A*m[oe]"ba\, n.; pl. L. {Am[oe]b[ae]}; E. {Am[oe]bas}.
   [NL., fr. Gr. ? change.] (Zo["o]l.)
   A rhizopod. common in fresh water, capable of undergoing many
   changes of form at will. See {Rhizopoda}.

Source : WordNet®

amoeba
     n : naked freshwater or marine or parasitic protozoa that form
         temporary pseudopods for feeding and locomotion [syn: {ameba}]
     [also: {amoebae} (pl)]

Source : Free On-Line Dictionary of Computing

Amoeba
     
        1.  A distributed {operating system}
        developed by {Andrew S. Tanenbaum} and others of {Vrije
        Universiteit, Amsterdam}.  Amoeba is only available under
        licence from the VUA, but is free of charge and includes all
        {source}, {binaries} and documentation.
     
        {Home (http://www.am.cs.vu.nl/)}.
     
        [Features?]
     
        2.  A derogatory term for {Commodore}'s
        {Amiga} {personal computer}.
     
        [{Jargon File}]
     
        (1997-05-07)