Whose

pronoun
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?
pronoun;, possessive whose; objective whom.
1.
what person or persons?:
Who did it?
2.
(of a person) of what character, origin, position, importance, etc.:
Who does she think she is?
3.
the person that or any person that (used relatively to represent a specified or implied antecedent):
It was who you thought.
4.
(used relatively in restrictive and nonrestrictive clauses to represent a specified antecedent, the antecedent being a person or sometimes an animal or personified thing):
Any kid who wants to can learn to swim.
5.
Archaic. the person or persons who.
Idioms
6.
as who should say, Archaic. in a manner of speaking; so to say.
determiner
1.

of whom? belonging to whom? used in direct and indirect questions: I told him whose fault it was, whose car is this?
(as pronoun): whose is that?

2.
of whom; belonging to whom; of which; belonging to which: used as a relative pronoun: a house whose windows are broken
pronoun
1.
which person? what person? used in direct and indirect questions: he can’t remember who did it, who met you?
2.
used to introduce relative clauses with antecedents referring to human beings: the people who lived here have left
3.
the one or ones who; whoever: bring who you want
abbreviation
1.
World Health Organization
who
WHO
World Health Organization