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.
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Origin of pill bug
An Americanism dating back to 1835–45
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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