from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various one-celled aquatic or parasitic protozoans of the genus Amoeba or related genera, having no definite form and consisting of a mass of protoplasm containing one or more nuclei surrounded by a flexible outer membrane. It moves by means of pseudopods.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A genus of unicellular protozoa that moves by means of temporary projections called pseudopodia.
  • n. The graph of the real part of the logarithms of a polynomial equation in complex numbers.

from the GNU version of the Collaborative International Dictionary of English

  • n. A rhizopod common in fresh water, capable of undergoing many changes of form at will. Same as ameba. See rhizopoda.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion


New Latin, genus name, from Greek amoibē, change, from ameibein, to change.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἀμοιβή (amoibē, "change"), referring to constantly changing shape of these organisms. (Wiktionary)


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  • JM wonders if an amoeba gets splitting headaches?

    June 19, 2011