libris

libris is a Latin form of liber, meaning “book”.

It can also be a form of libra, “pound (weight); balance, scales”. It is the ablative plural feminine noun.

Found 404 times in the Latin texts on Socratos.

Where it is used

Cicero, In C. Verrem 2.3.167: … cum esset magister scripturae et sex publicorum, quas ego Syracusis apud Carpinatium in litterarum adlatarum libris, Romae in litterarum missarum apud magistrum L. Tullium, familiarem tuum, inveni; quibus ex litteris impudent …

All forms of liber (declension table)

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.