1. Concave on both sides
   - biconcave

See also: concave

• Sennacherib
• Sennenhunde
• sennet
• Sennett
• sennight
• sennit
• sens
• sensate
• sensation
• sensational
• sensationalise
• sensationalism
• sensationalist
• sensationalistic
• sensationalize
• sensationally
• sense
• sense datum
• sense experience
• sense impression
• sense modality
• forceps delivery
• forcer
• Forces of Umar Al-Mukhtar
• forcible