Fons Yitæ (Lat.). A work of Ibn Gehirol, the Arabian Jewish philosopher of the Xlth century, who called it Me-gôr Hayyûn or the “Fountain of Life” (De Materia Universali and Fons Vitæ). The Western Kabbalists have proclaimed it a really Kabbalistic work. Several MSS.,Latin and Hebrew, of this wonderful production have been discovered by scholars in public libraries; among others one by Munk, in 1802. The Latin name of Ibn Gebirol was Avicebron, a name well-known to all Oriental scholars.
Source: H.P.Blavatsky - The Theosophical Glossary