1. A day when one's hair seems unmanageable; often then developing into a day when everything seems to go wrong, and one becomes increasingly irritable

Derived forms: bad hair days

• mainframe
• mainframe computer
• mainland
• mainland China
• mainline
• mainly
• mainmast
• mains
• mainsail
• mainsheet
• mainspring
• mainstay
• mainstream
• mainstreamed
• maintain
• maintainable
• maintained
• maintainer
• maintenance
• maintenance man
• maintenance staff
• Maintenon
• maintop
• maiolica
• maisonette