flagrum

Probably from *bʰleh₂- (“to swing back and forth”) +‎ *-rom, whence also flāgitō (“I demand”).

• (Classical) IPA^(key): /ˈfla.ɡrum/, [ˈfɫ̪äɡrʊ̃ˑ] or IPA^(key): /ˈflaɡ.rum/, [ˈfɫ̪äɡrʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈfla.ɡrum/, [ˈfläːɡrum] or IPA^(key): /ˈflaɡ.rum/, [ˈfläɡrum]

flagrum n (genitive flagrī); second declension

1. whip, scourge, lash

Second-declension noun (neuter).

• flagellum

• “flagrum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “flagrum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• flagrum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• “flagrum”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
• “flagrum”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
• De Vaan, Michiel (2008) “flagrum”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 224