rue

Concise Oxford English Dictionary © 2008 Oxford University Press:
rue1

▶verb (rues, rueing or ruing, rued) bitterly regret (a past event or action) and wish it undone. ▶noun archaic

• 1 repentance; regret.

• 2 compassion; pity.

– origin OE hrēow ‘repentance’, hrēowan ‘affect with contrition’, of Gmc origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
rue2

▶noun a perennial evergreen shrub with bitter strong-scented lobed leaves which are used in herbal medicine. [Ruta graveolens.]

■ used in names of plants that resemble rue, e.g. meadow rue.

– origin ME: from OFr., via L. from Gk rhutē.