| b vitamin | |
noun | |
| originally thought to be a single vitamin but now separated into several B vitamins [syn: B-complex vitamin] |
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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |