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volvelle

 - 1 dictionary result

vol⋅velle

[vol-vel]
–noun Astronomy.
a medieval instrument consisting of a series of concentric rotating disks, used to compute the phases of the moon and its position in relation to that of the sun.

Origin:
1400–50; late ME < ML volvella, equiv. to L volv(ere) to turn + -ella -elle
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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