an Old World, insect-eating mammal of the genus Erinaceus, esp. E. europaeus, having spiny hairs on the back and sides.

the porcupine.

Military .

a portable obstacle made of crossed logs in the shape of an hourglass, usually laced with barbed wire.

an obstructive device consisting of steel bars, angle irons, etc., usually embedded in concrete, designed to damage and impede the boats and tanks of a landing force on a beach.