fulcrum


Concise Oxford English Dictionary © 2008 Oxford University Press:
fulcrum /ˈfʊlkrəm, ˈfʌl-/
noun (pl. fulcra /-rə/ or fulcrums) the point against which a lever is placed to get a purchase, or on which it turns or is supported.
– origin C17: from L., lit. ‘post of a couch’, from fulcire ‘to prop up’.
'fulcrum' also found in these Oxford entries:

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