柯林斯詞典pepsin (also pepsine) 1. N a proteolytic enzyme produced in the stomach in the inactive form pepsinogen, which, when activated by acid, splits proteins into peptones 胃蛋白酶 返回 pepsin劍橋詞典an enzyme (= chemical substance made by living cells ) that breaks down protein in food in the stomach and is produced by glands there 胃蛋白酶 返回 pepsin