1. interrogatory - Noun
2. interrogatory - Adjective
A formal question or inquiry; esp. (Law), a question asked in writing.
Containing, expressing, or implying a question; as, an interrogatory sentence.
Source: Webster's dictionaryAn important source of information is the eighteen "Articles of Interrogatory," questions put to her in writing on behalf of Elizabeth I. See the supplement to Chambers, 2003. Source: Internet