sun porch
From Longman Dictionary of Contemporary EnglishRelated topics: Housesun porchˈsun porch noun [countable] American English DHHa room with large windows and often a glass roof, designed to let in lots of light SYN sun lounge British EnglishExamples from the Corpussun porch• We occupy the sun porch, a windowless living room with a fake marble fireplace and a dining room behind glass doors.