wheat bran
The outer layer of the wheat kernel, often used as a dietary fiber supplement or in animal feed.
Wheat bran is rich in dietary fiber.
Adding wheat bran to bread enhances its flavor.
ふすま is the more common Japanese word for wheat bran, while 小麦外皮 is a technical or descriptive term.
Compound of 小麦 (こむぎ, 'wheat') and 外皮 (がいひ, 'outer skin/husk').