also: めいんばんく
noun
main bank; principal bank
In Japanese corporate finance, the bank that serves as a company's primary lender and often holds a close, long-term relationship with the firm.
from English main bank
その企業のメーンバンクは三菱UFJ銀行だ。
That company's main bank is MUFG Bank.
メーンバンク
The main bank system is one of the characteristics of Japanese corporate finance.