Webster's English Dictionary

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flagellum

fla.gel.lum \fl*-'jel-*m\ \-*\ n or fla.gel.la also flagellums [NL, fr. L, 
   whip, shoot of a plant] pl  : any of various elongated filiform appendages 
   : as  : the slender distal part of an antenna  : a long tapering process 
   that projects singly or in groups from a cell a nd is the primary organ of 
   motion of many microorganisms : a long slender shoot