noun
: a disk marked with a set of concentric rings or toothed wheels that is moved in a circular path without causing it to revolve on its own axis causing the figures to appear to revolve on their axes
noun
: a disk marked with a set of concentric rings or toothed wheels that is moved in a circular path without causing it to revolve on its own axis causing the figures to appear to revolve on their axes
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012