provitamin A n.
Any of the carotenoids that are precursors of vitamin A and exhibit qualitatively the biological activity of beta-carotene; they are present in fish-liver oils, egg yolk, milk products, and green-leaf or yellow vegetables and fruits.
| a stew of meat, vegetables, potatoes, etc. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |