tryptophan /'triptәfæn/ 📖 中文释义 n. 色氨酸[化] 色氨酸; β-吲哚基丙氨酸 📘 English Definition（英文释义） n. an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin ← tryptonemia T 字母词表 tryptophan decarboxylase →