1. (noun)hound's-tongue, Cynoglossum virginaticum perennial shrub of North America having coarse tongue-shaped leaves and pale-blue to purple flowers Synonyms: hound's-tongue
2. (noun)hound's-tongue, Cynoglossum officinale biennial shrub of Europe and western Asia having coarse tongue-shaped leaves and dark reddish-purple flowers Synonyms: hound's-tongue