CLOCKWORK
clockwork
(noun) any mechanism of geared wheels that is driven by a coiled spring; resembles the works of a mechanical clock
Source: WordNet® 3.1
Etymology
Noun
clockwork (usually uncountable, plural clockworks)
A mechanism powered by a coiled spring and regulated by some form of escapement; the power is transmitted through toothed gearwheels and used to drive a mechanical clock, toy, or other device.
Source: Wiktionary
Clock"work`, n.
Definition: The machinery of a clock, or machinary resembling that of a
clock; machinery which produced regularity of movement.
Source: Webster’s Unabridged Dictionary 1913 Edition