noun, plural amoebas, amoebae [uh-mee-bee] . Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
amoeba or ameba (əˈmiːbə)
n , pl -bae, -bas
any protozoan of the phylum Rhizopoda, esp any of the genus Amoeba, able to change shape because of the movements of cell processes (pseudopodia). They live in fresh water or soil or as parasites in man and animals
[C19: from New Latin, from Greek amoibē change, from ameibein to change, exchange]
ameba or ameba (əˈmiːbə, -biː)
[C19: from New Latin, from Greek amoibē change, from ameibein to change, exchange]
a'moebic or ameba
a'mebic or ameba

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1855, from Mod.L. genus name (1841), from Gk. amoibe "change," related to ameibein "to change, exchange," from PIE *e-meigw-, extended form of base *mei- "to change, go, move" (see mutable). So called for its constantly changing shape.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

amoeba a·moe·ba (ə-mē'bə)
Variant of ameba.

Amoeba A·moe·ba (ə-mē'bə)
n. pl. a·moe·bas or a·moe·bae (-bē)

  1. A genus of protozoa of the class Sarcodina or Rhizopoda.

  2. Any of several genera of protozoa that are parasitic in humans, especially Entamoeba.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
amoeba   (ə-mē'bə)  Pronunciation Key 
Plural amoebas or amoebae (ə-mē'bē)
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. Amoebas move by means of pseudopods.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
amoeba [(uh-mee-buh)]

An animal composed of only one cell that has no fixed shape. It is the best known of the single-celled animals, or protozoa.

Note: The term amoeba is sometimes used to refer to something with an indefinite, changeable shape.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

Amoeba definition

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.
2. A derogatory term for Commodore's Amiga personal computer.
[Jargon File]
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Among his discoveries was that nonparasitic amoeba can fatally infect the
  brains of humans.
My once succulent buttocks now resemble a greasy, flatulent amoeba halfway
  through the process of mitosis.
Doctors did not realize it at the time, but he had a brain infection caused by
  a type of amoeba.
The boys sit out beside the sea while the chief lectures them on the merciless
  nobility of the amoeba.
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