/dis"koyd/ , adj. Also, discoidal .
1. having the form of a discus or disk; flat and circular.
2. Bot. (of a composite flower) consisting of a disk only, without rays.
n.
3. something in the form of a disk.
4. Dentistry. an excavator with a disklike blade.
[ 1785-95; discoides diskoeidés quoit-shaped. See DISCUS, -OID ]