Sentence:  An odd derivative of real tennis lasted until the latter part of the eighteenth century at Rattray in Perthshire. It was played in the churchyard by two pairs of men, and the method for starting the play was to throw the ball onto the church roof, using it like the sloping <WSD>penthouse</WSD> of the tennis court. 
Meaning of the word marked with <WSD> tags:  Any of the sloping roofs at the side of a real tennis court.