Glass: the transparent, hard material used for windows, tableware, etc. Often written in katakana as ガラス.
台風で店の硝子が割れてしまった。
The store's glass was broken by the typhoon.
休日は硝子細工の教室で器を作っています。
On my days off I make vessels in a glasswork class.
硝子コップに氷を入れて冷たい飲み物を出した。
I put ice in a glass cup and served a cold drink.