Entry 1 sense Webster, 1913 Whose /(ho͞oz)/ · IPA /huːz/ 01 pron. The possessive case of who or which. See Who, and Which. 1. The possessive case of who or which. See Who, and Which. See: Who, Which “Whose daughter art thou? tell me, I pray thee.” — Gen. xxiv. 23. “The question whose solution I require.” — Dryden.