[ C ] mainly UK the shiny brown poisonous nut of a horse chestnut tree七叶树果
conkers [ U ] UK a children's game in which you have a conker with a string through it and try to break another child's conker by hitting it with yours康克戏(儿童游戏,两人用串在绳上的七叶树果相击,击破对方七叶树果者获胜)