noun
Mitsui Zaibatsu
Historical Japanese industrial and financial conglomerate, one of the four major pre-war zaibatsu.
三井財閥は戦前の日本経済を支えた巨大企業グループだった。
The Mitsui Zaibatsu was a huge corporate group that supported the pre-war Japanese economy.
From the family name 三井 (Mitsui) and 財閥 (zaibatsu, 'financial clique').