(redirected from amebic)
Also found in: Dictionary, Thesaurus, Medical.
Related to amebic: amebic abscess


see amebaameba
or amoeba
, common name for certain one-celled organisms belonging to the phylum Sarcodina of the kingdom Protista. Amebas were previously classified as members of the animal kingdom.
..... Click the link for more information.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the order of the simplest organized protozoa of the class Sarcodina. Most live in fresh waters, a few in the soil; there are parasitic forms. They are usually of microscopic dimensions up to 50 μm, but there are also “giants” such as Pelomyxa, which grows to 2–3 mm. Amoebas have no constant body shape; their cytoplasmic body forms extrusions or pseudopodia which aid in motion and food gathering. They feed on bacteria, minute algae, and protozoa. The amoeba engulfs the food particle and from its cytoplasm the amoeba secretes digestive juices and forms a food vacuole within which the food is dissolved and is incorporated into the cytoplasm. The excretion of water (osmoregulation) and metabolic products occurs through the contractory vacuoles, which gradually accumulate waste matter and discharge it at the surface.

Amoebas ordinarily have one nucleus, but Pelomyxa is multinucleate. The majority of amoebas multiply asexually, dividing in two. The division of the body is preceded by mitosis in the nucleus. A sexual process is known only in very rare cases.

Upon subjection to unfavorable conditions—for instance, insufficient food, cold, or drying of the water body—the amoeba’s body becomes round and the surface of its cytoplasm becomes a dense protective layer; a cyst forms that is resistant to unfavorable effects of the dormant stage. Freshwater amoebas can serve as a water pollution index. Parasitic amoebas live in the intestines of various animals and man. Among these the most harmful is the dysentery amoeba (Entamoeba histolytica), which produces a severe form of amoebic dysentery in man. Infection occurs via cysts, which remain viable outside the human body.


Dogel’, V. A., Iu. I. Polianskii, and E. M. Kheisin. Obshchaia protozoologiia. Moscow-Leningrad, 1962.
Seravin, L. N. Dvigatel’nye sistemy prosteishikh. Leningrad, 1967.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(invertebrate zoology)
A genus of naked, rhizopod protozoans in the order Amoebida characterized by a thin pellicle and thick, irregular pseudopodia.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


(US), ameba
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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(operating system)
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.


(computer, abuse)
A derogatory term for Commodore's Amiga personal computer.
This article is provided by FOLDOC - Free Online Dictionary of Computing (
References in periodicals archive ?
Symptoms of pyogenic and amebic liver abscesses are similar and most commonly include fever and abdominal pain.
Hyun Jo et al., "Amebic Liver Abscess in HIV-infected Patients, Republic of Korea," Emerging Infectious Diseases, vol.
Endoscopic features such as cryptitis and crypt abscesses, as well as erosions and ulceration of the rectum, which are commonly seen in ulcerative colitis, may also be present in amebic colitis [25, 44].
In addition, the company said Impavido has received orphan drug designation in treating Primary Amebic Meningoencephalitis (PAM), the brain infection caused by the water-born amoeba Naegleria fowleri and Acanthamoeba Keratitis, and is the first Rx product launched in the US.
Pleuropulmonary complications (i.e., pleural effusion, lung abscess, and, rarely, pleural empyema) are the second most frequent extraintestinal complication; they occur in 720% of patients with amebic liver abscesses and in 2-3% of those with invasive disease [6].
Primary Amebic Meningoencephalitis caused by Naegleria fowleri, Karachi, Pakistan.
The pathogenesis of amebic liver abscess (ALA) has been studied both in animal models (Ventura et al, 2002; Tsutsumi & Shibayama, 2006) and in humans by anatomical characteristics (Perez-Tamayo, 1990).
microbiological culture from blood and/or aspirate, stool examination, amebic serology), type of imaging study, abscesses characteristics (i.e., site, size and numbers of abscesses), type of interferences and duration of admission.
Huston, "Parasite and host contributions to the pathogenesis of amebic colitis," Trends in Parasitology, vol.
Acanthamoeba castellanii is one of the etiological agents of chronic granulomatous amebic encephalitis [10] and amoebic keratitis, a progressive and painful sightthreatening eye infection [11-13].
The Chutia, Sonowal Kachan, Tai Ahom and Ao Naga tribal groups of Disoi Valley Reserve Forest of Jorhat District, Assam, India, use floral parts of the plant against amebic dysentery [7].