Noun

1. Small mammal characterized by its spiny back and by its habit of rolling itself into a ball when attacked.
2. A type of moveable military barricade made from crossed logs or steel bars, laced with barbed wire, used to damage or impede tanks and vehicles; Czech hedgehog.
3. The nickname for a type of depth charge weapon that simultaneously fires a number of explosives into the water to create a pattern of underwater explosions intended to attack submerged enemies.
4. A type of chocolate cake (or slice), somewhat similar to an American brownie.