VITREOUS

I. adjective Etymology: Middle English, from Latin, from vitrum glass Date: 14th century 1. resembling glass (as in color, composition, brittleness, or luster) ; glassy , characterized by low porosity and usually translucence due to the presence of a glassy phase , of, relating to, derived from, or consisting of glass, of, relating to, or constituting the ~ humor , II. noun Date: 1869 ~ humor