1. Low-growing shrub with spreading branches and flowers in loose heads; desert regions of western United States (California to Utah)
   - wild buckwheat, California buckwheat

Type of: eriogonum

• Ostrya carpinifolia
• Ostrya virginiana
• Ostryopsis
• Ostwald
• Ostwald's theory of indicators
• Ostyak
• Ostyak-Samoyed
• Oswald
• Oswald Spengler
• Oswald Veblen
• oswego tea
• Otaheite arrowroot
• Otaheite arrowroot starch
• otalgia
• Otaria
• Otaria Byronia
• Otariidae
• otc
• OTC market
• OTC security
• OTC stock
• Othello
• other
• other half
• other than