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pill bug

noun
  1. 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. 2018
British Dictionary definitions for pillbug

pill bug

noun
  1. any of various woodlice of the genera Armadillidium and Oniscus, capable of rolling up into a ball when disturbed
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for pillbug

n.

also pill-bug, 1841, from pill (n.) + bug (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper