Disc: see disk.
Discal: on or relating to the disc of any surface or structure.
Discal area: of a wing applies especially to the more central portion, or that area covered by the discal cell.
Discal bristles: Diptera; are inserted on the middle of the abdominal segments before the hind margin.
Discal cell: Lepidoptera; the large or median cell extending from the base of the wing toward the center: = radial cell (Comst.): in Diptera (Will.) = 1st medial 2 (Comst.): Odonata; = discoidal areolets, q.v.: Trichoptera, the cell between the forks of the radial sector, and separated from the 2d apical cell by a cross-vein.
Discal patch: in some male Hesperidae the oblique streak of specialized black scales on the disc of the primaries.
Discal vein: Lepidoptera; the cross-vein closing the discal or median cell extends from radius 5 to media 1.
Disciform: formed or shaped like a disc.
Discocellular nervure or vein: Lepidoptera; = discal vein, q.v.
Discoidal: relating to the disc, or middle = discal.