[fool-kruhm, fuhl-]
noun, plural fulcrums, fulcra [fool-kruh, fuhl-] .
the support, or point of rest, on which a lever turns in moving a body.
any prop or support.
Zoology. any of various structures in an animal serving as a hinge or support.
verb (used with object)
to fit with a fulcrum; put a fulcrum on.

1665–75; < Latin: back-support of a couch, apparently for fulctrum, equivalent to fulc(īre) to hold up, support + -trum noun suffix of instrument

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World English Dictionary
fulcrum (ˈfʊlkrəm, ˈfʌl-)
n , pl -crums, -cra
1.  the pivot about which a lever turns
2.  something that supports or sustains; prop
3.  a spinelike scale occurring in rows along the anterior edge of the fins in primitive bony fishes such as the sturgeon
[C17: from Latin: foot of a couch, bedpost, from fulcire to prop up]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1670s, "a prop, a support," borrowing of L. fulcrum "bedpost," from fulcire "to prop up, support" (see balk).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fulcrum ful·crum (ful'krəm, fŭl'-)
n. pl. ful·crums or ful·cra (-krə)

  1. The point or support on which a lever pivots.

  2. An anatomical structure that acts as a hinge or a point of support.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fulcrum   (fl'krəm)  Pronunciation Key 

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The point or support on which a lever turns. The position of the fulcrum, relative to the positions of the load and effort, determines the type of lever.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
fulcrum [(fool-kruhm, ful-kruhm)]

The point on which a lever is balanced when a force is exerted.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Grip the bottle's neck with your other hand to act as a fulcrum.
In such a world the central bank would no longer have the fulcrum it currently uses to change interest rates.
The individual merits the fulcrum of fantasy, only it's the branding of fantasy.
Rest its fulcrum on a board to protect other flagstones.
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