The Japanese noun 'たんぱく' (tanpaku) refers to 'protein', a vital nutrient essential for building and repairing tissues in the body. It is commonly used in contexts related to health, nutrition, and biology. For example: This food is high in protein「この食べ物はたんぱくが豊富です」(このたべものはたんぱくがほうふです). I need to eat more protein「もっとたんぱくを摂る必要がある」(もっとたんぱくをとるひつようがある). The word is often used in scientific or dietary discussions and is a shortened form of 'たんぱくしつ' (tanpakushitsu), which also means 'protein'.