Vitreous may refer to:
Materials Glass, an amorphous solid material Vitreous enamel, a material made by fusing powdered glass to a substrate by firing Vitreous lustre, a glassy luster or sheen on a mineral surface
Biology Vitreous body, a clear gel that fills the space between the lens and the retina in vertebrate eyes Vitreous membrane, a layer of collagen separating the vitreous body from the rest of the eye
See also Vitrification, the transformation of a substance into a glass Vitreous kernel count, a way to measure protein contents of the grain