1rare Allowing the passage of light so that objects within or on the other side can be seen clearly; = "translucent".
2Allowing light to pass through diffusely; semi-transparent; (sometimes also) emitting or reflecting a diffuse, soft light; = "translucent". Now somewhat rare.
Early 17th century; earliest use found in Helkiah Crooke (1576–1648), physician and anatomist. From classical Latin translūcidus transparent or translucent from trans- + lūcidus.