vitamin /'vitamin US: 'vait-; 'vaitamm/ n [C] any of a number of organic substances which are present in certain food-stuffs and are essential to the health of man and other animals: 維他命; 維生素： illnesses (eg scurvy, rickets) caused by ~ deficiency- 因缺乏維生素而引起的疾病 (如壞血病，佝僂 .病);' ~ tablets. 維他命片。