1. North American perennial herb; leaves are used medicinally; sometimes placed in genus Cassia
   - wild senna, Senna marilandica

Type of: herb, herbaceous plant

Part of: genus Senna

• improved
• improvement
• improver
• improvidence
• improvident
• improvidently
• improving
• improvisation
• improvisational
• improvisatory
• improvise
• improvised
• improvised explosive device
• improviser
• improvize
• imprudence
• imprudent
• imprudently
• impudence
• impudent
• impudently
• impudicity
• impugn
• impugnable
• impugner