Pronunciation: (hOOz),[key] —pron. 1. (the possessive case of who used as an adjective): Whose umbrella did I take? Whose is this one? 2. (the possessive case of which used as an adjective): a word whose meaning escapes me; an animal whose fur changes color. 3. the one or ones belonging to what person or persons: Whose painting won the third prize?