Dis"coid (?), a. [Gr. quoit-shaped, a round plate, quoit + form, shape: cf. F. discoide. See Disk.]
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.
© Webster 1913.
Dis"coid, n.
Anything having the form of a discus or disk; particularly, a discoid shell.
© Webster 1913.