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flagellum (n.)

"long, lash-like appendage," 1837, from Latin flagellum "whip, scourge," also figurative, diminutive of flagrum "a whip," from PIE root *bhlag- "to strike" (source also of Latin flagitium "shameful act, passionate deed, disgraceful thing," flagitare "to demand importunately;" Old Norse blakra "to flutter with the wings," blekkja "to impose upon;" Lithuanian blaškau,blaškyti "to and fro").

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Definitions of flagellum from WordNet

flagellum (n.)
a whip used to inflict punishment (often used for pedantic humor);
Synonyms: scourge
flagellum (n.)
a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa);
From wordnet.princeton.edu