Definition of rue

• n. - A perennial suffrutescent plant (Ruta graveolens), having a strong, heavy odor and a bitter taste; herb of grace. It is used in medicine.
• n. - Fig.: Bitterness; disappointment; grief; regret.
• v. t. - To lament; to regret extremely; to grieve for or over.
• v. t. - To cause to grieve; to afflict.
• v. t. - To repent of, and withdraw from, as a bargain; to get released from.
• v. i. - To have compassion.
• v. i. - To feel sorrow and regret; to repent.
• v. t. - Sorrow; repetance.