fulcrum

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fulcrum:

see leverlever,
simple machine consisting of a bar supported at some stationary point along its length and used to overcome resistance at a second point by application of force at a third point. The stationary point of a lever is known as its fulcrum.
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fulcrum

[′fu̇l·krəm]
(mechanics)
The rigid point of support about which a lever pivots.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

fulcrum

1. the pivot about which a lever turns
2. a spinelike scale occurring in rows along the anterior edge of the fins in primitive bony fishes such as the sturgeon
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005