rue

Short definition from Wiktionary

Noun

1. 1
   Sorrow; repentance; regret.
2. 2
   Pity; compassion.
3. 3
   Any of various perennial shrubs of the genus Ruta, especially the herb Ruta graveolens (common rue), formerly used in medicines.

Verb

1. 1
   To repent of or regret (some past action or event); to wish that a past action or event had not taken place.
2. 2
   To cause to repent of sin or regret some past action.
3. 3
   To cause to feel sorrow or pity.
4. 4
   To feel compassion or pity; to take pity (on), to have compassion (on).
5. 5
   To feel sorrow or regret.

Proper noun

1. 1
   A surname.