s]
. | 1. | a circular disk more than 7 in. (18 cm) in diameter and 2.2 lb. (1 kg) in weight, usually wooden with a metal rim and thicker in the center than at the edge, for throwing for distance in athletic competition. |
| 2. | the sport of throwing this disk for distance. |

disco- or disc- or disci-
pref.
Disk: discoid.
discus dis·cus (dĭs'kəs)
n. pl. dis·ci (dĭs'kī', dĭs'ī')
A flat circular surface; a disk.