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Bacteria

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Definition

Bacteria (bak-teer-ee-uh)

A type of one-celled organism that has no cell nucleus and that reproduces by splitting in half.  

 

Singular: Bacterium

 

Part of Speech:

Noun, plural.

 

In a sentence

The live bacteria in yogurt are said to aid digestion and promote good health.

Synonyms & Antonyms
Synonyms: 

Microbes

Microorganisms

Bacilli

Antonyms: 

 None

Word facts

In 1675, a Dutch man, Anthony van Leeuwenhoek, noticed “little animals” in rainwater that he was examining through a microscope.   That’s how bacteria were discovered, and that’s why the observant man, who had no formal science education, is now called “the Father of Microbiology.”

Because the first "little animals" that scientists observed were shaped like little sticks, they were named bacteria, from the Greek word bacterion, meaning a rod or stick.