Obs. rare. [L.] Glass; a glassy substance; a glass vessel.
1657. Physical Dict., Vitrum, glass: it’s used to signifie glass distilling vessels, or any other vessels made of glass.
1665. Hooke, Microgr., 51. A certain thin Lamina of a vitrum or vitrified part of the Metal.
1694. Salmon, Bate’s Dispens. (1713), 547/1. Le Febure makes the Salt … of the Glass…, but he mingles the Vitrum with its equal Weight of Sulphur in Pouder.
