expletive

(1)profane or obscene expression usually of surprise or anger; "expletives were deleted"

(2)通例驚きや怒りを表す不敬な、または猥褻な表現

(3)a word or phrase conveying no independent meaning but added to fill out a sentence or metrical line

(4)文や韻文の行に加えられる、独立した意味を持たない語やフレーズ