in·ter·rog·a·tive 
(ĭn′tə-rŏgə-tĭv)
(ĭn′tə-rŏgə-tĭv)adj.
1. Asking a question or being of the nature of a question: an interrogative raising of the eyebrows.
2. Of, relating to, or being an element or construction used to ask a question: an interrogative adverb; an interrogative particle.
n.
1. A word or form used to ask a question.
2. A sentence or an expression that asks a question.
in′ter·roga·tive·ly adv.