duel

n. 决斗

ducal, duchess, duchy, duck, duck-boards, duck-yard, ducking, duckling, ducks and drakes, duckweed, duct, ductile, ductility, ductless gland, dud, dude, dudgeon, duds, due, due to, duellist, duenna, duet, duff, duffer, duffle (also duffel), duffle bag, duffle-coat, dug, dug-out, duke, dukedom, dulcet, dulcimer, dull, dullard, dullness, dully, duly, dumb,