whose

Universal Words determiner, pronoun 1 used in questions to ask who sth belongs to: Whose house is that? * I wonder whose this is. 2 used to say which person or thing you mean: He's a man whose opinion I respect. * It's the house whose door's painted red. 3 used to give more information about a person or thing: Isobel, whose brother he was, had heard the joke before.