Dis"coid (?), a. [Gr. &?; quoit-shaped, &?; a round plate, quoit + &?; form, shape: cf. F. discoïde. 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.
Dis"coid, n. Anything having the form of a discus or disk; particularly, a discoid shell.
Dis*coid"al (?), a. [Cf. F. discoïdal.] Disk-shaped; discoid.
Dis"co*lith (?), n. [Gr. &?; a round plate + -lith.] (Biol.) One of a species of coccoliths, having an oval discoidal body, with a thick strongly refracting rim, and a thinner central portion. One of them measures about of an inch in its longest diameter.
Dis*col"or (?), v. t. [imp. & p. p. Discolored (?); p. pr. & vb. n. Discoloring.] [OE. descolouren, OF. descolorer, F. décolorer, fr. L. dis- + cololare, coloratum, to color, color color. See Color.] [Written also discolour.] 1. To alter the natural hue or color of; to change to a different color; to stain; to tinge; as, a drop of wine will discolor water; silver is discolored by sea water.