1. A sticky low herb with small reddish-purple flowers; widespread in the northern hemisphere
   - herb robert, herbs robert, Geranium robertianum

Type of: crane's bill, cranesbill

• O ring
• O'Brien
• O'Casey
• o'clock
• O'Connor
• o'er
• O'Flaherty
• O'Hara
• O'Keeffe
• O'Neill
• O'Toole
• O. Henry
• oaf
• oafish
• oafishly
• oafishness
• Oahu
• Oahu Island
• oak
• oak apple
• oak blight
• oak chestnut
• oak fern
• Oak Leaf Cluster
• oak tree