• WordNet 3.6
    • n ameba naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion
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Century Dictionary and Cyclopedia
    • n ameba etc.
    • n ameba [capitalized] A genus of microscopic rhizopodous Protozoa, of which A. diffluens, common in all fresh-water ponds and ditches, is the type. It exists as a mass of protoplasm, and moves about and grasps particles of food, etc., by means of pseudopodia, or finger-like processes, which it forms by protruding portions of its body. From thus continually altering its shape it received its former name of proteus animalcule. Within the body are usually found a nucleus and nucleolus, and certain clear spaces, termed contractile vesicles, from their exhibiting rhythmical movements of contraction and dilatation. There is no distinct mouth, and food seized by means of the pseudopodia is engulfed within the soft sarcode-body and by any portion of its surface, the apertures by which the food is taken in closing up immediately after its reception. Reproduction takes place in several ways, but chiefly by fission, whereby an amœba simply divides into two portions, each of which becomes a distinct animalcule. Several other species have been described; but there is reason to think that some of these, at least, may be early forms of other and more complex animals, or even of plants. The term appears to have been first used by Ehrenberg in 1830, as the name of a genus of his Polygastrica.
    • n ameba An animal of the genus Amœba.
    • n ameba Any single cell or corpuscle of one of the higher animals; a cell regarded as itself an animal, and an individual of the morphological grade of development of an amœboid organism.
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In literature:

His soul is a Dead Sea that supports neither ameba nor fish, neither noxious bacilli nor useful life.
"Little Journeys To the Homes of the Great, Volume 3 (of 14)" by Elbert Hubbard
Yet, is man any less a unit than the Ameba, or any other simple organism?
"The Continental Monthly, Vol. 3, No. 1 January 1863" by Various
With a grunt of amazement, Greg slammed a beam straight into the heart of the amebas.
"Empire" by Clifford Donald Simak
The cells are like the tiny animal, the ameba, and can take in the food by any part of their bodies.
"Applied Physiology" by Frank Overton
His soul is a Dead Sea that supports neither ameba nor fish, neither noxious bacilli nor useful life.
"The Roycroft Dictionary" by Elbert Hubbard
The ameba solves this difficulty by dividing to form two amebae.
"Being Well-Born" by Michael F. Guyer