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booklouse

or book louse

[boo k-lous]
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noun, plural book·lice [boo k-lahys] /ˈbʊkˌlaɪs/.
  1. any of numerous minute, wingless insects of the order Psocoptera, often living among books or papers.
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Origin of booklouse

First recorded in 1865–70; book + louse
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for booklouse

booklouse

noun plural -lice
  1. any small insect of the order Psocoptera, esp Trogium pulsatorium (common booklouse), a wingless species that feeds on bookbinding paste, etc
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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