1. Concave on both sides
   - concavo-concave

See also: concave

• ebracteate
• Ebro
• Ebro River
• EbS
• ebullience
• resonating chamber
• resonator
• resorb
• resorcinol
• resorcinolphthalein
• resorption
• resort
• resort area
• resort hotel
• resound
• resounding
• resoundingly
• resource
• resourceful
• resourcefully
• resourcefulness
• resourceless
• resow
• respect
• respectability