구들이 · 구들을
gudeul, ondol (underfloor heating system); heated floor
Example
구들은 아궁이의 열로 방바닥을 데우는 난방 방식이에요.
Gudeul is a heating method that warms the floor with heat from the fireplace.
Word parts
The native word for the heated-floor system; 온돌 is the Sino-Korean equivalent.