1 a person or thing that regulates
2 the mechanism, including the hairspring and the balance wheel, by which the speed of a timepiece is regulated
3 a timepiece, known to be accurate, by which others are timed and regulated
4 any of various mechanisms or devices, such as a governor valve, for controlling fluid flow, pressure, temperature, voltage, etc.
5 (Also called)
regulator gene a gene the product of which controls the synthesis of a product from another gene
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"