1. a small mammal with short spines covering its back and sides that can roll into a ball when threatened
2. a military defensive obstacle made of steel beams or spikes
Usage: military

Examples

• The hedgehog rolled into a tight ball when the dog approached.
• We spotted a hedgehog crossing the garden path at dusk.
• Hedgehogs are nocturnal animals that eat insects and small creatures.
• The pet store had several hedgehogs available for adoption.
• Military engineers placed hedgehogs along the beach to prevent enemy landings.
• The hedgehog’s spines provide excellent protection from predators.