vitreous

adj

1. Of or resembling glass; glassy.

   “Pressing his fingertips against the rippled, vitreous surface, he had the odd sensation that were he to apply sufficient pressure the glass would give way like a permeable membrane, and he would be able to pass right through it, but when he pushed harder, the surface remained cold and unyielding.”

2. Of or relating to the vitreous humor of the eye.
3. Having a shiny nonporous surface.
4. Of a semi-crystalline substance where the atoms exhibit short-range order, but without the long-range order of a crystal.
5. With a glass-like texture, often referring to volcanic rocks that cooled too quickly for crystals to form.
6. (dated)Positive (of electric charge).

noun

1. (uncountable, usually)The vitreous humor.