The Collaborative International Dictionary of English v.0.48:
Ex libris \Ex` li"bris\ [L. ex from + libris books.] An inscription, label, or the like, in a book indicating its ownership; esp., a bookplate. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
ex libris n 1: a label identifying the owner of a book in which it is pasted [syn: bookplate, ex libris]