noun
or cipher wheel
: a device for enciphering and deciphering in substitution cipher consisting of two movable concentric disks with the letters of the alphabet written around the margin of each
noun
or cipher wheel
: a device for enciphering and deciphering in substitution cipher consisting of two movable concentric disks with the letters of the alphabet written around the margin of each
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012