center of percussion

noun Mechanics.

the point on a rigid body, suspended so as to be able to move freely about a fixed axis, at which the body may be struck without changing the position of the axis.

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Origin:
1720–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Center of percussion is always a great word to know.

So is doohickey. Does it mean:

a gadget; dingus; thingumbob.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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