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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. |
| Main Entry: | tree ring1 |
| Part of Speech: | n |
| Definition: | any of the concentric rings of the cross-section of a tree trunk, representing a year's growth; the layer of wood produced by a year's growth in a woody plant; also called annual ring |
| Main Entry: | tree ring2 |
| Part of Speech: | n |
| Definition: | one of the markings on fauna that correspond to a year's growth; also called annulus |