CORONA, noun [Latin , A crown.]
1. In architecture, a large flat member of a cornice, crowning the entablature, and the whole order; called by workmen the drip.
2. In anatomy, the upper surface of the molar teeth or grinders.
3. In botany, the circumference or margin of a radiated compound flower. Also, the appendage to the top of seeds, which enables them to disperse.
4. In optics, a halo or luminous circle around the sun, moon or stars.