regulator

Etymology

The OED takes it as borrowed from Medieval Latin regulator, used from the 14th century in British sources,^[2] formed from the past participle stem of regulō (“to control, direct”) with a Latin agent suffix.^[2] Etymonline, Dictionary.com and the Shorter Oxford describe it as an agent noun formed in English from regulate and -or.^[3][4][5] The verb is from rēgula (“rule, straight piece of wood”),^[2][3] from Proto-Indo-European *reg- (“to move in a straight line”).^[3] The OED compares French régulateur (a noun from 1728), Spanish regulador and Italian regolatore.^[2]

Earliest recorded meaning

A person who or thing which regulates or controls: 1648, in M. Nedham's Loyalty speakes Truth.^[2][6] Etymonline dates it to the 1650s.^[3]

Semantic evolution

The mechanical sense, a device that controls the speed of a machine or the flow of gas or water, is recorded from 1661 in the OED and 1702 in Etymonline.^[2][3] Johnson (1755) defined it as "that part of a machine which makes the motion equable".^[7] The spring or pendulum that controls the speed of a clock is recorded from 1676, and an accurate clock used to set other clocks from 1735.^[2] Etymonline has the last sense from 1758.^[3] In English history the regulators were members of the commission set up by James II in 1687 to influence parliamentary elections by removing officers and freemen (1688).^[2][6] In America the name was taken by extralegal groups in the late 18th and 19th centuries, recorded from 1753 in the OED and 1767 in Etymonline;^[2][3] Merriam-Webster names the North Carolina association of 1767–1771 that resisted official extortion.^[6] The 20th century added an agency that supervises an industry (1959), a regulator gene (1960) and, in British economics, a change in tax rates between budgets (1961).^[2] In Northumberland and Durham coal-mining a regulator was a doorway with sliding lattice frames that controlled the passage of air.^[8] Green's Dictionary of Slang also records it as a slang word for the vagina.^[9]

Timeline

• 1648 – a person or thing that regulates.^[2][6]
• 1661 – a device controlling the speed of a machine or a flow.^[2]
• 1676 – the part controlling the speed of a clock.^[2]
• 1688 – a member of James II's commission of 1687.^[2]
• 1735 – an accurate clock for setting others.^[2]
• 1753 – a member of an extralegal group in North America.^[2]
• 1959 – an official or agency that supervises an industry.^[2]
• 1960 – a regulator gene.^[2]

Meanings

Noun

1. A person or thing that regulates or controls something.^[10][6][2]
2. An official or agency that supervises an industry or business activity: The energy regulator capped household bills.^[2][5]
3. A device that controls the flow, pressure or level of a gas, liquid, voltage or temperature, or the speed of a machine.^[10][2]
4. The mechanism, such as a hairspring and balance wheel or a pendulum, that controls the speed of a clock or watch.^[10][2]
5. An accurate clock by which other timepieces are set.^[10][2]
6. (genetics) A gene whose product controls the activity of another gene; a regulator gene.^[10][2]
7. (history) A member of the commission set up by James II in 1687 to influence the election of members of Parliament.^[6][2]
8. (history) A member of any of various extralegal bands in the United States in the late 18th and 19th centuries, especially one in North Carolina in 1767–1771.^[6][2]

Word family

• thermoregulator
• voltage regulator

Related words

• rector
• regimen
• regiment
• region
• regular
• regulate
• regulation
• rule

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
5. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
6. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
8. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)
9. ^ Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com
10. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins