Abbreviation of 間投詞 (かんとうし). Used in grammatical or linguistic discussions.
See also: 間投詞
間投 is an abbreviation of 間投詞 and is used as a grammatical term.
interjection
interjectory particle
Abbreviation of 間投詞 (かんとうし), itself a compound of 間 (interval) and 投 (throw), referring to words 'thrown in' between other words.