|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.|
|volva (vŏl'və, vôl'-) Pronunciation Key
A cuplike structure around the base of the stalk of certain basidiomycete fungi.