pill-bug

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:
1835–45, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pill bug
 
n
any of various woodlice of the genera Armadillidium and Oniscus, capable of rolling up into a ball when disturbed

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