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flagellum Syllabification: fla·gel·lum
Pronunciation: /ˌfləˈjeləm/

Definition of flagellum in English:

noun (plural flagella-ˈjelə)

A slender threadlike structure, especially a microscopic whiplike appendage that enables many protozoa, bacteria, spermatozoa, etc., to swim.
Example sentences
  • Development of the spermatid flagellum begins immediately after meiosis.
  • This study was designed to learn how well the flagella of groups of bacteria might move fluid in a microscopic environment.
  • Cilia and flagella are hairlike organelles extending from the cell surface.


Pronunciation: /fləˈjelər/ /ˈflajələr/
Example sentences
  • In most cases, this was confirmed by the observation of the flagellar axoneme in additional serial sections.
  • If you knock out the flagella motor then the flagella is paralysed and flagellar secretion continues, but at reduced rate.
  • The flagellar filament, the bacterial organelle of motility, is the smallest rotary propeller known.


Early 19th century (denoting a whip or scourge): from Latin, diminutive of flagrum 'scourge'.

Definition of flagellum in:
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