American Dictionary of the English Language

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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.