🔧 A limiting device 🚫 A control limit 🔤 A set limiter

restrictor

1 7.0

A device that limits how much something moves or flows

noun
/rɪˈstrɪktər/

Specialized

: limitador

There have been several reports of pump-related safety issues, such as inconsistent infusion-rate accuracy associated with variability in body temperature, location of sensor-fluid restrictors, and fill volume (16, 17).
restrictor plate
restrictor carburetor
restrictor-plate racing

Examples

I took the restrictor plate off, give the Red Dragon a little more juice.

Old School (2003)
So you'd have to like fill it up and then divert it or put a restrictor in the pipe.
Michael Waltrip will drive in three of the four restrictor plate races (excluding the Daytona 500 in the #55).

Blog text (28)
Examples are low-flow showerheads, faucet flow restrictors, and low-flow toilets.

Academic text (2002)
I hate those low-flow shower heads, so I remove the flow restrictors, install a quarter-turn ball valve just behind the shower head, and use it at full blast to get wet and rinsed, but have it off the rest of the time.

Blog text (24)
A low-flow showerhead uses a restrictor to limit the amount of water that flows through it.
In many racing events, a restrictor is installed to reduce the engine's horsepower for safety reasons.
A faucet restrictor helps conserve water by controlling the flow rate during use.

Synonyms

restraint

vsrestrictor

73 4.7

Something used to hold a person or animal still

is a device or part rather than an act or state of prevention

stopper

vsrestrictor

13 2.1

An object that blocks a hole to keep liquid or gas inside

is a broader limiting part that also controls flow or movement elsewhere

resistor

vsrestrictor

Specialized

7 4.1

A small electrical part that limits the flow of electric current in a circuit

is a wider concept applying to many flows and amounts beyond electricity

limiter

vsrestrictor

Specialized

4 6.5

A device that stops something from going above a set level, for example sound or speed

is a general part that limits movement, flow, or amount more broadly

throttler

vsrestrictor

Specialized

7.7

A device or program that limits how fast data and requests move

is broader, limiting movement or amount not only to avoid overload

arrester

vsrestrictor

Specialized

6.5

A device that stops movement or limits flow in machines and electrical systems

is a general limiting part, not restricted to machinery or electricity

decelerator

vsrestrictor

Specialized

6.5

A device that slows movement or reduces speed

is broader, limiting movement or amount, not only lowering speed

arrestor

vsrestrictor

Specialized

6.1

A device that stops or slows moving parts to keep people safe

is a general limiter of movement, flow, or amount beyond safety stops

stopblock

vsrestrictor

5.7

A block that keeps a vehicle from moving past the end of a track

is more general, able to limit flow, amount, or movement in many ways

obstructor

vsrestrictor

8.1

An object that blocks a path or movement

often limits amount or flow more generally rather than only blocking progress

Antonyms

enabler

11 4.6

Something that helps people or groups succeed

expander

2 4.4

A tool used to make things wider, for example a jaw or a pipe

How Restrictive

blockage

38 4.1

stopper

13 2.1

restrictor

Specialized

1 7.0

valve

Specialized

153 4.1

opening

179 1.0

Surface Forms

restrictor singular

restrictors plural

Morphology

restrictor = restrict (transparent) = restrict + or

Clear agent/instrument nominalization from the verb 'restrict' using the productive suffix '-or', so the meaning 'thing that limits' is directly derivable.

Etymology

Restrictor comes from the Latin parts re- 'back' and stringere 'to draw tight', the same root as strict and string, giving the picture of something being pulled tight. So a restrictor is a part or device that 'tightens' or limits movement or flow to control how much can pass.