Any roughness was levelled by polishing with ivory or a smooth shell.
The roughness of the surface of the cavity serves to retard it.
In the school of Wolgemut Diirer learned much, by his own account, but suffered not a little from the roughness of his companions.
In complete human albinoes, albinism is correlated, in addition to nystagmus, with a peculiar roughness of the skin, making it harsh to the touch.
In wind-fertilized plants the flowers are comparatively inconspicuous and devoid of much attraction for insects; and their pollen is smoother and smaller, and better adapted for transport by the wind, than that of insectfertilized plants, the roughness of which adapts it for attachment to the bodies of insects.