volvelle: Meaning and Definition of

vol•velle

Pronunciation: (vol'vel), [key]
— n. Astron.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
volva volvent
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