noun
old mother; aged mother
A somewhat formal or literary term for one's own elderly mother, or an elderly mother in general. In casual speech, 年老いた母 or おばあさん is more common.
彼は老母を田舎に残して上京した。
He left his aged mother in the countryside and moved to Tokyo.
老母の介護のために仕事を辞めた。
I quit my job to care for my elderly mother.