Definition of "amoeba" []

• 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. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "‡ The term amoeba is sometimes used to refer to something with an indefinite, changeable shape."
• "The small jelly-speck, which we call the amoeba, has no organs save what it can extemporize as occasion arises."
• "The small jelly-speck, which we call the amoeba, has no organs save what it can extemporise as occasion arises."