Among Roronoa Zoro's swords in the "One Piece" series, the cursed sword he possesses is Sandai Kitetsu. Sandai Kitetsu is the third sword that Zoro acquires during his journey. It is known to be a cursed blade with a reputation for bringing misfortune and tragedy to its wielders.

The curse associated with Sandai Kitetsu is mentioned in the series, suggesting that those who wield the sword are destined to encounter hardship. Despite the curse, Zoro chooses to accept and wield Sandai Kitetsu, showing his determination and fearlessness in the face of adversity.

Zoro's decision to use a cursed sword aligns with his character's unwavering resolve and determination to become the world's greatest swordsman, as he believes that his skill and strength can overcome any curse or obstacle.