Webster's English Dictionary

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fulcrum

ful.crum \'fu.l-kr*m, 'f*l-\ \-kr*\ n or fulcrums or ful.cra [LL, fr. L, 
   bedpost, fr. fulcire to prop - more at BALK] pl  1a: PROP; specif : the 
   support about which a lever turns  1b: one that supplies capability for 
   action  2: a part of an animal that serves as a hinge or support