02325 Co*ro"na (k?-r?"n?), n.; pl. L. Coron\'91 (-n), E. Coronas (-nz). [L. corona crown. See Crown.] 1. A crown or garland bestowed among the Romans as a reward for distinguished services.2. (Arch.) The projecting part of a Classic cornice, the under side of which is cut with a recess or channel so as to form a drip. See Illust. of Column.3. (Anat.) The upper surface of some part, as of a tooth or the skull; a crown.4. (Zo\'94l.) The shelly skeleton of a sea urchin.5. (Astrol.) A peculiar luminous apearance, or aureola, which surrounds the sun, and which is seen only when the sun is totally eclipsed by the moon.6. (Bot.) (a) An inner appendage to a petal or a corolla, often forming a special cup, as in the daffodil and jonquil. (b) Any crownlike appendage at the top of an organ.7. (Meteorol.) (a) A circle, usually colored, seen in peculiar states of the atmosphere around and close to a luminous body, as the sun or moon. (b) A peculiar phase of the aurora borealis, ...