Rue n.
1. Bot. A perennial suffrutescent plant (Ruta graveolens), having a strong, heavy odor and a bitter taste; herb of grace. It is used in medicine.
Then purged with euphrasy and rue
The visual nerve, for he had much to see. --Milton.
They [the exorcists] are to try the devil by holy water, incense, sulphur, rue, which from thence, as we suppose, came to be called herb of grace. --Jer. Taylor.
2. Fig.: Bitterness; disappointment; grief; regret.
Goat's rue. See under Goat.
Rue anemone, a pretty springtime flower (Thalictrum anemonides) common in the United States.
Wall rue, a little fern (Asplenium Ruta-muraria) common on walls in Europe.