Definition of flagellum
: any of various elongated filiform appendages of plants or animals: such as
a
: the slender distal part of an antenna
b
: a long tapering process that projects singly or in groups from a cell and is the primary organ of motion of many microorganisms
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Merriam-Webster unabridged
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Time Traveler for flagellum
The first known use of flagellum was in 1852
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