|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 gadget; dingus; thingumbob.|
bioactivity bi·o·ac·tiv·i·ty (bī'ō-āk-tĭv'ĭ-tē)
The effect of a given agent, such as a vaccine, upon a living organism or on living tissue.