Webster's Revised Unabridged Dictionary · 1913

Interjectional

Interjectional , adjective

1.
Thrown in between other words or phrases; parenthetical; ejaculatory; as, an interjectional remark.
2.
Pertaining to, or having the nature of, an interjection; consisting of natural and spontaneous exclamations.
Certain of the natural accompaniments of interjectional speech, such as gestures, grimaces, and gesticulations, are restrained by civilization. — Earle