whose

pronoun

1. Of whom, belonging to whom; used as an interrogative pronoun.

- Whose wallet is this?

2. Of whom, belonging to whom; used as a relative pronoun.

- This is the man whose dog caused the accident. (=This man's dog caused the accident.)

3. (formerly proscribed) Of which, belonging to which; used as a relative pronoun.

- We saw several houses whose roofs are falling off. (=The roofs are falling off several houses we saw.)