1. A valve that regulates the flow of a fluid, such as the valve in an internal-combustion engine that controls the amount of air-fuel mixture entering the cylinders.
2. A lever or pedal controlling such a valve.
tr.v. throt·tled, throt·tling, throt·tles
a. To regulate the flow of (fuel) in an engine.
b. To regulate the speed of (an engine) with a throttle.
2. To suppress: tried to throttle the press.
3. To strangle (a person); choke.
[Short for throttle valve, from throttle, to strangle, choke, from Middle English throtelen, probably from throte, throat; see THROAT.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.