1. A shape that curves or bends inward
   - concave shape, concavity, incurvation

Derived forms: incurvatures

Type of: solid

• amphibious operation
• amphibious vehicle
• amphibiously
• amphibole
• amphibole group
• Amphibolips
• amphibolite
• amphibology
• amphiboly
• amphibrach
• Amphicarpa
• Amphicarpa bracteata
• Amphicarpaea
• Amphicarpaea bracteata
• amphichiral
• amphictyony
• amphidiploid
• amphidiploidy
• amphigory
• amphimacer
• amphimixis
• Amphineura
• Amphioxidae
• amphioxus
• amphipod