1. Depressed like a navel

See also: concave

• Populus tremuloides
• Populus trichocarpa
• porbeagle
• porc
• porcelain
• porcelain clay
• porcelainise
• porcelainize
• porcellaneous
• Porcellio
• Porcellionidae
• porch
• porcine
• porcino
• porcupine
• porcupine ball
• porcupine provision
• porcupinefish
• porcupines
• pore
• pore fungus
• pore mushroom
• porgy
• Porifera
• poriferan