A structure built against a wall to support or reinforce it.

दीवार को सहारा देने वाला निर्माण

English Usage: The ancient cathedral had several buttresses to support its tall walls.

Hindi Usage: प्राचीन कैथेड्रल में अपनी ऊँची दीवारों को सहारा देने के लिए कई दीवालियाँ थीं।