Sanhedrin
Concise Oxford English Dictionary © 2008 Oxford University Press:
Sanhedrin /ˈsanɪdrɪn, sanˈhiːdrɪn, sanˈhɛdrɪn/ (also Sanhedrim /-rɪm/)
▶noun the highest court of justice and the supreme council in ancient Jerusalem.
– origin from late Heb. sanhedrīn, from Gk sunedrion ‘council’, from sun- ‘with’ + hedra ‘seat’.
'Sanhedrin' also found in these Oxford entries:

