goat's rue /ˈɡoʊts ɹuː/ noun4 •Certain herbaceous plants in the family Fabaceae. •Galega officinalis (French lilac, Italian fitch, Spanish sainfoin). •Tephrosia lindheimeri (Lindheimer's hoarypea), of Texas. •Tephrosia virginiana (catgut, devil's shoestring), native to the United States.