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Webster 1913 Edition

Adj.

Thrown in between other words or phrases; parenthetical; ejaculatory;

as, an

interjectional

remark

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.

Adj.

Thrown in between other words or phrases; as an interjectional remark.

interjectional ‎(comparative more interjectional, superlative most interjectional)

Being or pertaining to an interjection.
"Ouch!" is an interjectional utterance.