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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 chattering or flighty, light-headed person. |
"Let us understand what our own selfish genes are up to, because we may then at least have the chance to upset their designs." [Richard Dawkins, "The Selfish Gene," 1976]