discal (diskal)

[ the teeth of the lampreys on the surface of the sub circular oral disk between the mouth and the teeth, concentric with the periphery of the disk. - Discal cell, in entom., a large cell at the base of the wing of lepid opters, sometimes divided longitudinally into two. - Discal spot, in entom., a round spot behind the middle of the wing, seen in most species of the lepidopterous family Noctuide. Also called orbicular spot.