Dermatogen \Der*mat"o*gen\, n. [Gr. de`rma, -atos, skin + -gen.] (Bot.) Nascent epidermis, or external cuticle of plants in a forming condition. Dermatogen \Der*mat"o*gen\, n. [Gr. de`rma, -atos, skin + -gen.] (Bot.) Nascent epidermis, or external cuticle of plants in a forming condition.