pill bug


noun

any of various small terrestrial isopods, especially of the genera Armadillidium and Oniscus, which can roll themselves up into a spherical shape.

Origin of pill bug

An Americanism dating back to 1835–45

Example sentences from the Web for pill bug

British Dictionary definitions for pill bug

pill bug

noun

any of various woodlice of the genera Armadillidium and Oniscus, capable of rolling up into a ball when disturbed