1. Stimulating interest or thought
   "a thought-provoking book"
   - challenging

See also: stimulating

• 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