vitrum

English

Etymology

From Latin vitrum.

Noun

vitrum (plural vitra)

1. (obsolete) Glass; a glassy material.
   • 1665, Robert Hooke, Micrographia:

     I imagine it to be some small parcel of the Steel, which by the violence of the motion of the stroke […] is made so glowing hot, that it is melted into a Vitrum, which by the ambient Air is thrust into the form of a Ball.