This is the 3983rd most frequent Korean word.
유리
"Glass" or "advantage," depending on context.
In this sentence, '유리' is used as a noun meaning 'glass', describing the material from which the cup is made.
이 유리컵을 사용할까요?
Shall we use this glass cup?
Here, '유리' is used as an adjective form ('유리하다'), meaning 'advantageous' or 'beneficial', referring to a favorable circumstance.
유리한 위치에 있다는 것은 큰 장점입니다.
Being in an advantageous position is a great benefit.
'유리' again refers to the material 'glass', emphasizing the potential hazard associated with broken glass.