楼梯 (lóu tī) literally combines 楼 (lóu), meaning 'building' or 'floor', and 梯 (tī), meaning 'ladder' or 'step'. Together, they form the compound noun for 'staircase'—a fixed structure of steps connecting different levels within a building. It refers specifically to indoor or outdoor permanent stairways, not temporary ladders or escalators.

This word is commonly used in everyday descriptions of buildings, directions, safety instructions, and architectural contexts. You’ll hear it when giving directions ('Go up the staircase'), describing accessibility features ('There’s no elevator, only stairs'), or reporting maintenance issues ('The staircase is slippery'). Unlike the more general term 阶梯 (jiē tī), which can refer to any set of steps—including outdoor stone steps or bleachers—楼梯 almost always implies a built-in, functional part of a multi-story structure.