What is av beis din?

Some articles on av beis din, beis:

Moshe Aryeh Freund
... Moshe Aryeh Freund (1894 – 1996) was the Chief Rabbi (av beis din) of the Edah HaChareidis in Jerusalem ... in 1904 in the Hungarian town of Honiad, where his father, Rabbi Yisroel Freund, served as av beis din ... of the Remo, the Maharshal, the Shach, and the Beis Yosef ...

Famous quotes containing the word din:

    I would say it was the coffin of a midget
    Or a square baby
    Were there not such a din in it.
    Sylvia Plath (1932–1963)