Definition of leg muff in US English:

leg muff

noun

  • 1A downy tuft of feathers on the leg of a bird, as in certain hummingbirds and domestic pigeons.

  • 2An item of clothing worn by women to keep the leg warm.

Origin

Mid 19th century; earliest use found in John G. Wood (1827–1889), natural historian and microscopist. From leg + muff.