bookworm

[book-wurm]
noun
1.
a person devoted to reading or studying.
2.
any of various insects that feed on books, especially a booklouse.

Origin:
1590–1600; book + worm

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
bookworm (ˈbʊkˌwɜːm)
 
n
1.  a person excessively devoted to studying or reading
2.  any of various small insects that feed on the binding paste of books, esp the book louse

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

bookworm
1590s (of people), 1855 of insects or maggots; there is no single species known by this name, which is applied to the anolium beetle, silverfishes, and book lice.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica
Encyclopedia

bookworm

any insect (e.g., moths, beetles) whose larval (or adult) forms injure books by gnawing the binding and piercing the pages with small holes. No single species may properly be called the bookworm because a large number of insects feed upon dry, starchy material or paper and may damage books

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The site is free, and hundreds of bookworm lonely-hearts have already signed up.
In so many motion pictures does brawn get the break over brain that it is indeed encouraging when the bookworm finally turns.
Everything he does is so silly that one can't possibly look upon him as a bookworm.
It doesn't even have anything to do with whether you're a bookworm or a nerd or a geek.
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