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relative position of the fulcrum in three basic types of levers, with arrows indicating the direction of the effort and the downward force of the load
n. pl. ful·crums or ful·cra (-krə)
1. The point or support on which a lever pivots.
2. Zoology An anatomical structure that acts as a hinge or a point of support.
3. An agent through which vital powers are exercised.
[Latin, bedpost, from fulcīre, to support.]