amoeba
noun
amoe·ba
| \ ə-ˈmē-bə
\
\
variants:
or less commonly ameba
plural amoebas
or amoebae\ -(ˌ)bē
\
\
Definition of amoeba
: any of a large genus (Amoeba) of naked rhizopod protozoans with lobed and never anastomosing pseudopodia, without permanent organelles or supporting structures, and of wide distribution in fresh and salt water and moist terrestrial environments
broadly
: a naked rhizopod or other amoeboid protozoan
Illustration of amoeba
amoeba: 1 pseudopodium, 2 nucleus, 3 contractile vacuole, 4 food vacuole
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Examples of amoeba in a Sentence
Recent Examples on the Web
The scene at a Biden event is one of genial chaos: Biden allows himself to be swarmed by followers after his speeches, taking selfies as he is followed by a crowd that moves with him, amoeba-style. — Los Angeles Times, "The debate Democrats have waited for: Joe Biden vs. Elizabeth Warren," 29 Aug. 2019 Health officials say the amoeba is known to have infected just 145 people in the U.S. from 1962 through 2018. — NBC News, "Brain-eating amoeba kills person who swam in North Carolina manmade lake," 25 July 2019 Naegleria fowleri, known as the brain-eating amoeba, caused Gray's death, the North Carolina Department of Health and Human Services said in a press release. — Madeline Holcombe, CNN, "Brain-eating amoeba kills man who went swimming at North Carolina water park," 26 July 2019 Health officials say the amoeba is known to have infected just 145 people in the U.S. from 1962 through 2018. — CBS News, "Brain-eating amoeba kills man after North Carolina water park visit," 26 July 2019 Lakshmi adds that freshwater can also be home to potentially dangerous amoeba, albeit very rarely. — Jamie Ducharme, Time, "Your Summer Beach Trip Could Put You at Risk of Getting Sick. Here's What You Need to Know," 24 July 2019 The eye infection is caused by a microscopic, free-living amoeba called Acanthamoeba that's commonly found in water and soil. — NBC News, "Woman nearly loses sight in one eye after wearing contacts in shower and pool," 17 July 2019 Nearly 40 years ago, scientists discovered that an amoeba called Paulinella chromatophora plays host to a photosynthetic structure that in some ways resembles cyanobacteria, the original ancestors of chloroplasts. — Quanta Magazine, "Tiny Genomes May Offer Clues to First Plants and Animals," 20 June 2013 The Tour de France peloton, the amoeba-like mass of more than 100 cyclists who ride fast and hip-to-hip, had come to one of the ubiquitous roundabouts when Pinot and his team made a split-second decision to go left instead of right. — Michael Powell, New York Times, "On the Road With the Tour de France," 18 July 2019These example sentences are selected automatically from various online news sources to reflect current usage of the word 'amoeba.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for amoeba
amoeba
noun
English Language Learners Definition of amoeba
: a tiny living thing that consists of a single cell
See the full definition for amoeba in the English Language Learners Dictionary
amoeba
noun
amoe·ba
| \ ə-ˈmē-bə
\
\
plural amoebas
or amoebae\ -bē \
Kids Definition of amoeba
: a tiny water animal that is a single cell which flows about and takes in food
amoeba
noun
amoe·ba
| \ ə-ˈmē-bə\
Medical Definition of amoeba
1
capitalized
: a large genus of naked rhizopod protozoans that have lobed and never anastomosing pseudopodia and are widely distributed in fresh and salt water and moist terrestrial environments
2
also ameba plural amoebas
or amoebae\ -(ˌ)bē \
also amebas
or amebae
: a protozoan of the genus Amoeba
broadly
: an amoeboid protozoan (as a naked rhizopod)
\
also amebas
or amebae
: a protozoan of the genus Amoeba
broadly
: an amoeboid protozoan (as a naked rhizopod)
Other Words from amoeba
amebic
or amoebic \ -bik
\
adjective
\
adjective
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