brown fat

American  

noun

1. brownish-yellow adipose tissue in the upper back, or interscapular, region of many mammals, most conspicuously in hibernating species and human newborns, composed of numerous innervated fat cells that can produce heat during cold stress; thermogenic tissue.

---

brown fat British  

noun

1. tissue composed of a type of fat cell that dissipates as heat most of the energy released when food is oxidized; brown adipose tissue. It is present in hibernating animals and human babies and is thought to be important in adult weight control

---

Etymology

Origin of brown fat

First recorded in 1950–55

Example Sentences

The researchers also identified a receptor called PLXNA1 that binds to one of the SLIT3 fragments and helps regulate nerve development in brown fat.

From Science Daily • Mar. 28, 2026

In contrast, brown fat is present in smaller amounts and plays a specialized role in controlling body temperature and supporting metabolic health.

From Science Daily • Mar. 28, 2026

In contrast, mice genetically engineered to make unusually high amounts of ACOX2 in brown fat showed increased heat production, better cold tolerance and improved insulin sensitivity and weight control when fed the same high-fat diet.

From Science Daily • Oct. 9, 2025

Unlike white fat, which stores energy, or muscle, which uses it immediately, brown fat helps keep the body warm in cold environments.

From Science Daily • Oct. 9, 2025

On 'Joggles,' such a dear brown fat cob.

From In Brief Authority by Anstey, F.