Rav muvhak

 ( Jewish Education ) 

Rav muvhak (Hebrew: רב מובהק) refers to the teacher from whom a student rabbi received "most of his knowledge".http://www.dafyomi.co.il/bmetzia/halachah/bm-hl-033.htm - Bava Metzia, daf 33, sourced to R'Meir Thus, muvhak could be understood as "principal", or "primary". Correspondingly, talmid muvhak may refer to a rabbi's primary, or outstanding, student.

The typical usage is to state that a particular student's rav muvhak is rabbi A, whereas the student also studied under rabbi B. Rabo (Hebrew: רבו) means his rav/rebbe/rabbi, hence the term rabo muvhak, i.e. "his principal rabbi".http://www.ateret.org.il/uploads/filebank/pdfeng_0224_OntheAir78.pdf According to halakha, special honour must be given to a rav muvhak. Rav Muvhak - Rabbi Moshe Bleich, Journal of Jewish Education, Sivan 5758

In modern times most student rabbis are educated by a number of different rabbis. Therefore, the concept rav muvhak is now uncommon.