1. Small perennial herb of cooler regions of North America with racemose purple flowers
   - purple cress

Type of: bitter cress, bittercress

• one-track mind
• one-trillionth
• one-twelfth
• one-two
• one-upmanship
• one-way
• one-way light time
• one-way street
• one-winged
• one-woman
• one-year
• one-year-old
• Onega
• Oneida
• oneiric
• oneirism
• oneiromancer
• oneiromancy
• oneness
• onerous
• onerously
• onerousness
• oneself
• onetime
• ongoing