English Lexicon

Bacteria

/bækˈtɪər.i.ə/
nounCEFR B2 (Upper)Top #4500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A large domain of single-celled, prokaryotic microorganisms lacking a distinct nucleus, found abundantly in all habitats on Earth.

    "Certain bacteria in the gut play a crucial role in human digestion."
  2. 2

    Microscopic organisms, some of which are beneficial while others can cause disease or decay.

    "Washing your hands thoroughly helps to remove harmful bacteria."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the Modern Latin plural of bacterium, originating from the Greek baktēria, meaning 'staff' or 'cane' due to the rod-like shape of the first discovered species. The term entered scientific English in the late 19th century through microbiology as researchers began categorizing microscopic single-celled organisms.

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