1. A very well-known public figure 
2. A brand name that is well known to the great majority of households

Derived forms: household names

• ironclad
• ironed
• ironic
• ironical
• ironically
• ironing
• ironing board
• ironist
• ironlike
• ironman
• ironmaster
• ironmonger
• ironmonger's shop
• ironmongery
• irons
• ironshod
• ironside
• Ironsides
• ironstone
• ironware
• ironweed
• ironwood
• ironwood tree
• ironwork
• ironworker