superfluid

American  

[soo-per-floo-id] / ˌsu pərˈflu ɪd /

noun

1. a fluid that exhibits frictionless flow, very high heat conductivity, and other unusual physical properties, helium below 2.186 K being the only known example.

---

adjective

1. of or relating to a superfluid.

superfluid British  

/ ˌsuːpəˈfluːɪd /

noun

1. physics a fluid in a state characterized by a very low viscosity, high thermal conductivity, high capillarity, etc. The only known example is that of liquid helium at temperatures close to absolute zero

---

adjective

1. being or relating to a superfluid

superfluid Scientific  

/ so̅o̅′pər-flo̅o̅′ĭd /

1. A fluid, such as liquid helium, that flows with little or no friction at temperatures close to absolute zero.

---

Other Word Forms

• superfluidity
  noun

Etymology

Origin of superfluid

First recorded in 1940–45; super- + fluid

Example Sentences

See Examples For:

superfluid

Until now, however, the same approach had not succeeded with molecules immersed in a superfluid.

From Science Daily ● Jul. 4, 2026

To build the system, the researchers used radio waves to inject magnons into a Helium-3 superfluid cooled to temperatures near absolute zero.

From Science Daily ● May 5, 2026

The microscope allowed them to observe a frictionless flow of electrons behaving like a "superfluid," moving together and oscillating at terahertz frequencies within the material.

From Science Daily ● Mar. 17, 2026

In bilayer graphene, the excitonic superfluid and likely supersolid only appear under strong magnetic fields.

From Science Daily ● Feb. 5, 2026

When excitons were densely packed, they flowed freely as a superfluid.

From Science Daily ● Feb. 5, 2026