英语释义
1. an amphoteric organic acid containing the amino group NH2 especially any of the various amino acids having the amino group in the alpha position that are the chief components of proteins and are synthesized by living cells or are obtained as essential components of the diet
2. any one of many acids that occur naturally in living things and that include some which form proteins
3. any of various acids containing carbon and nitrogen that are building blocks of protein and are made by living plant or animal cells or are obtained from the diet
4. an amphoteric organic acid containing the amino group NH2 especially alpha-amino acid