noun. Any of various terrestrial isopod crustaceans of the suborder Oniscidea, having a gray or brown oval segmented body and commonly found in damp places such as under logs. Some woodlice can roll into a ball.

noun. A terrestrial isopod crustacean (suborder Oniscoidea) with a rigid, segmented exoskeleton, often capable of being rolled into a ball, found in damp, dark places, and feeding only on dead plant matter, usually lives under stones or bark.

"Other names have evolved more colloquially and imaginatively: the Armadillidium is also variously known as a woodlouse, gramfy-gravy, pill bug, roly-poly, monkey pea or cheesy bug."

Wikipedia article on the woodlouse  

woodlots