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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 arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| agonic line | |
| —n | |
| an imaginary line on the surface of the earth connecting points of zero magnetic declination | |
| agonic line (ā-gŏn'ĭk) Pronunciation Key
An imaginary line on the Earth's surface connecting points where the magnetic declination is zero. The agonic line is a line of longitude on which a compass will show true north, since where magnetic declination is zero, magnetic north coincides with geographic north. |