vítrea

Vítrea is a term that can refer to several different things, primarily relating to glass or glassy substances. In the context of biology, it often refers to the vitreous humor, the gel-like substance that fills the space in the eyeball behind the lens and in front of the retina. This clear, jelly-like material helps the eye maintain its shape and allows light to pass through unobstructed to the retina. Its composition is largely water, with a small percentage of collagen, salts, and other molecules.

In geology, the term vitric is used to describe volcanic rocks that are composed primarily of volcanic glass, which is formed when lava cools too rapidly to form crystalline structures. This glass is often characterized by its conchoidal fracture.

More broadly, the adjective "vitreous" simply means resembling glass or having the properties of glass. This can apply to materials in various scientific and artistic contexts, describing their clarity, brittleness, or smooth, shiny surface. The word itself derives from the Latin word "vitrum," meaning glass. Therefore, anything described as vitreous is typically being compared to or sharing characteristics with common glass.