Etymology: Middle English, from Latin, from vitrum glass
Date: 14th century
a. resembling glass (as in color, composition, brittleness, or luster) ; glassy <vitreous rocks> b. characterized by low porosity and usually translucence due to the presence of a glassy phase <vitreous china> 2. of, relating to, derived from, or consisting of glass 3. of, relating to, or constituting the vitreous humor <vitreous surgery> II. noun Date: 1869 vitreous humor
New Collegiate Dictionary. 2001.