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

• mystically
• Mysticeti
• mysticism
• mystification
• mystified
• mystifier
• mystify
• mystifying
• mystique
• myth
• mythic
• mythical
• mythical being
• mythical creature
• mythical monster
• mythical place
• mythicise
• mythicize
• mythographer
• mythologer
• mythologic
• mythological
• mythologisation
• mythologise
• mythologist