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epitrochoid

[ep-i-troh-koid]

Geometry.

a plane curve generated by the motion of a fixed point on the radius or extension of the radius of a circle that rolls externally, without slipping, on a fixed circle. The epitrochoid is a generalization of the epicycloid.

Origin:
1835–45; epi- + trochoid

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

So is doohickey. Does it mean:

a gadget; dingus; thingumbob.

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

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epicycloid

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epitrochoid

ep·i·tro·choid