The crossword solutions for the term 'AMINO OR CITRIC' are 'ACID'. Amino acids and citric ACID are both types of acids. Amino acids are organic compounds that contain an amine group, a carboxylic ACID group, and a side chain that varies between different amino acids. Citric ACID is a weak organic ACID found in citrus fruits and other plants. It is a key intermediate in the citric ACID cycle, which is a major metabolic pathway in all living organisms.