Noah Webster
Discus
DISCUS, noun [Latin]
1. A quoit; a piece of iron, copper or stone, to be thrown in play; used by the ancients.
2. In botany, the middle plain part of a radiated compound flower, generally consisting of small florets, with a hollow regular petal, as in the marigold and daisy.
3. The face or surface of the sun or moon. [See Disk.]