1. Flat on one side and concave on the other

See also: concave

• advertizement
• advertizer
• advertizing
• advertorial
• advice
• advice and consent
• Advil
• advisability
• advisable
• advisably
• advise
• advised
• advisedly
• advisee
• advisement
• adviser
• advisor
• advisory
• advisory board
• advisory service
• advocacy
• advocate
• advocation
• advocator
• advowson