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See also: Fulcrum


The triangle is the fulcrum.


Borrowed from Latin fulcrum (bedpost, foot of a couch), from fulciō (prop up, support).


  • IPA(key): /ˈfʊlk.ɹəm/, /ˈfʌlk.ɹəm/
  • (file)
  • (file)


fulcrum (plural fulcrums or fulcra)

  1. (mechanics) The support about which a lever pivots.
    It is possible to flick food across the table using your fork as a lever and your finger as a fulcrum.
    • 2010, John Allison, Bad Machinery[1]:
      MILDRED: Archimedes said give me a lever long enough and a fulcrum on which to place it and I will move the world.
      CHARLOTTE: Yeah she said that twaddle eight or nine times.
    • 2012 March, Henry Petroski, “Opening Doors”, in American Scientist[2], volume 100, number 2, pages 112–3:
      A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place.
  2. (figurative) A crux or pivot; a central point.
    • 2006, Rebecca Langlands, Sexual Morality in Ancient Rome, page 119:
      By this point the fulcrum of concern is the stuprum of men upon men, described as more prevalent than that upon women.
    • 2021 March 31, Phil McNulty, “England 2-1 Poland: What shape are Gareth Southgate's side in?”, in BBC Sport[3]:
      Chelsea's Mason Mount is a top-class talent while West Ham midfielder Declan Rice has moved his game on to another level this season and will be the fulcrum of England's midfield this summer.




From fulciō +‎ -crum.



fulcrum n (genitive fulcrī); second declension

  1. bedpost
  2. foot (of a couch)
  3. couch


Second-declension noun (neuter).

Case Singular Plural
Nominative fulcrum fulcra
Genitive fulcrī fulcrōrum
Dative fulcrō fulcrīs
Accusative fulcrum fulcra
Ablative fulcrō fulcrīs
Vocative fulcrum fulcra


  • Catalan: fulcre
  • English: fulcrum
  • French: fulcrum
  • Italian: fulcro
  • Portuguese: fulcro
  • Spanish: fulcro


  • fulcrum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • fulcrum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • fulcrum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • fulcrum”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin