Definitions for ex librisɛks ˈli brɪs, ˈlaɪ-
Random House Webster's College Dictionary
ex li•brisɛks ˈli brɪs, ˈlaɪ-(adv.; n.)(pl.)-bris.
(adv.)from the library of (a phrase inscribed in or on a book before the name of the owner).
Origin of ex libris:
1875–80; < L: from the books (of)
bookplate, ex libris(noun)
a label identifying the owner of a book in which it is pasted
A bookplate which identifies the owner of the book into which it is pasted
Origin: ; see the definition below.