ガラス

がらす
noun
glass
1. glass
A hard, transparent material made from sand; also refers to glass objects like windows.
Glass is dangerous.
The window glass is clean.
I accidentally broke a glass cup.
Glass breaks easily, so please don't leave it near children.
A child threw a ball and broke the window glass, so we have to put in new glass.

ガラス is a loanword from Portuguese/Dutch 'glas,' referring to the transparent material glass or objects made of glass. It's written in katakana because of its foreign origin.

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NOTE: ガラス refers to the material, while グラス typically refers to drinking glasses.