Rabbi who taught a student most of his knowledge
Rav muvhak (Hebrew: רב מובהק) refers to the teacher from whom a student rabbi received "most of his knowledge". 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". According to Jewish law, special honour must be given to a "rav muvhak".
In modern times most student rabbis are educated by a number of different rabbis. Therefore, the concept "rav muvhak" is now uncommon.
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