penthouse

1. (now historical) A structure or annexe (especially one with a sloping roof) extending from the side of a building, sometimes as protection from the weather.Examples: "At length, recommending himself to God, he let go one end of his cord, and suffered himself to fall down upon an old shed or penthouse, which, with the weight of his body, fell in with great noise."historical

2. (by extension, now rare) Something forming a shelter or canopy over something; an awning, shelter, etc.Examples: "The proboscis […] is doubled up by means of the joint, and in that position lies secure under a scaly penthouse."archaicbroadly

3. (tennis) Any of the sloping roofs at the side of a real tennis court.Examples: "2005, Tony Collins (ed.), Encyclopaedia of Traditional British Rural Sports, Routledge, page 262, 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 penthouse of the tennis court."