Interrogative means having the form of a question. An interrogative tone, the interrogative form, interrogative pronouns.
In grammar it names the sentence type and the words that build one, so who, what and which are interrogative pronouns. Of a look or a voice it means questioning.
1adjectiveinterrogativeHaving the form of a question.
“He raised an interrogative eyebrow and waited.”
interrogative is a quality.
Latin interrogativus comes from interrogare, to ask, from inter plus rogare, to ask.
Latin
interrogātīvus
English, today
interrogative
From Latin interrogātīvus, equivalent to interrogate + -ive.
Etymology from Wiktionary, CC BY-SA