A library or collection of books; an archaic or variant form of bibliotheca.
From Greek biblio- (book) + -theke (storage/repository). This older form reflects the direct translation from Greek before it evolved into the more common Latin-influenced form.
The word bibliothec shows how ancient Greek structured knowledge preservation—'theke' meant storage box, so libraries were literally 'book boxes,' which is exactly what they were before buildings got fancy.
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