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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| sonic depth finder | |
| —n | |
| See also sonar an instrument for detecting the depth of water or of a submerged object by means of sound waves; Fathometer | |