1. Low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States
   - bluebonnet, buffalo clover, Texas bluebonnet

Type of: lupin, lupine

• Otus sunia
• ou
• Ouachita
• Ouachita River
• oubliette
• ouch
• ought
• oughtn't
• ouguiya
• Ouija
• Ouija board
• Oujda
• ounce
• our
• Our Lady
• Our Lady's bedstraw
• Our Lady's mild thistle
• Our Lord's candle
• Ouranopithecus
• Ouranos
• ours
• ourself
• ourselves
• Ouse
• Ouse River