Are not cups in ceramic?
Discussion
They are, but how do you call ceramic mugs without a wing?
Here we call with wing = chávenas, without wing = copo (glass, (not of glass, but of ceramic...🤣)
Got it :)
In Italian, the name depends on the material: cups are always ceramic, glasses glass.
Instead cups can be both in ceramic (more common) or glass.
Fun fact: coffee purists prefer glass cups because glass absorbs less flavor and makes coffee more authentic.

