1. Very leafy malodorous tropical weedy shrub whose seeds have been used as an adulterant for coffee; sometimes classified in genus Cassia
   - coffee senna, mogdad coffee, stinking weed, Senna occidentalis, Cassia occidentalis

Derived forms: styptic weeds

Type of: senna

• Ornithopoda
• ornithopter
• Ornithorhynchidae
• Ornithorhynchus
• Ornithorhynchus anatinus
• ornithosis
• Orobanchaceae
• orogeny
• orography
• oroide
• orology
• Orono
• Orontium
• Orontium aquaticum
• oropharyngeal
• oropharynx
• orotund
• orotundity
• Orozco
• orphan
• orphan site
• orphanage
• orphaned
• orphanhood
• orphans' asylum