The thick, jelly-like substance that fills the human eye behind the lens and gives the eye its natural rounded shape. Occasionally, this gel becomes clouded due to bleeding or injury, and must be removed by an ophthalmologist. This surgical removal is called a vitrectomy.
That degree of vitrification evidenced by low water absorption; vitreous generally signifies less than 0.5% absorption, except for floor and wall tile and low-voltage electrical porcelain which are considered vitreous up to 3.0% water absorption.
literally, like glass, meaning the ceramic body is nonporous (won't absorb water). All fine china is vitrified because its ingredients include silica, which literally turns to glass when fired at high temperatures, giving it strength. Most stoneware, porcelain and bone china is vitrified. Vitrified products are usually dishwasher-and microwave-safe, though it also depends on the decoration. Vitrified china is also much more chip-resistant and stronger.
Vitreous refers to a material in an amorphous, glassy state (in contrast to a crystalline state). In such a state, the constituent atoms do not exhibit the long-range order that is characteristic of crystals. However, they still exhibit short-range order -- the separation of atoms and/or the lengths of covalent bonds are very close to their typical equilibrium distances.