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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. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| signal (sĭg'nəl) Pronunciation Key
A fluctuating quantity or impulse whose variations represent information. The amplitude or frequency of voltage, current, electric field strength, light, and sound can be varied as signals representing information. |