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“biblioklepts”
A book thief or someone who steals books: Besides the direct biblioklept there is the indirect thief who borrows and never returns books to their proper owners (including a library).
Here is a news article about a bibliokleptomaniac.
This entry is located in the following units:
biblio-, bibli-, bibl-, biblico-
(page 2)
klept-, klepto-, -kleptic; clepto-, clept-, -clepty, -cleptic
(page 1)