Discoid

a.	1.	Having the form of a disk, as those univalve shells which have the whorls in one plane, so as to form a disk, as the pearly nautilus. Discoid flower (Bot.) a compound flower, consisting of tubular florets only, as a tansy, lacking the rays which are seen in the daisy and sunflower.
n.	1.	Anything having the form of a discus or disk; particularly, a discoid shell.

Adj.

1.

discoid - having a flat circular shape Synonyms: discoidal, disklike

circular, discoidal, disklike, round