|a scrap or morsel of food left at a meal.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
provirus pro·vi·rus (prō'vī'rəs, prō-vī'-)
n. pl. pro·vi·rus·es
The precursor or latent form of a virus that is capable of being integrated into the genetic material of a host cell and being replicated with it.