from The Century Dictionary.
- noun A small and generally circular movable plate affixed to an engraving containing a dial or lottery, and made to carry the index-hand or pointer; any movable engraving superimposed on another for the purpose of showing variations.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A type of slide chart, a
paperconstruction with rotatingparts, formerly used for organizationand calculationin astronomyand other subjects.
Sorry, no etymologies found.
Doctors and barbers used wheel diagrams like a 1486 volvelle from the guild book of the Barber Surgeons of York (also in Circa 1492) to determine propitious occasions for surgery.
20One of Publicius's wheels includes a vermiform serpent as its central volvelle rather than moveable rings, a detail perhaps conceived as a metonymic means to open and close the vermis valve in the brain, activating cogitation and recollection.