Google defines the first meaning as, “a hard, brittle substance, typically transparent or translucent, made by fusing sand with soda and lime and cooling rapidly.”
This material is used to make windows, drinking containers, and other articles.
A drinking ‘glass’ is the most prominent.
They would predominantly be fragile in nature.
They need to be handled with care.
The other kind of glass would be a lens.
Yet another kind would refer to spectacles worn for better vision.
