Looking up...
A child of one's older brother (typically used by a younger sibling to refer to their older brother's child).
お兄ちゃん子は学校に行きます。
The older brother's child goes to school.
This term is often used affectionately by younger siblings when referring to their older brother's child.
This term is typically used in casual, familial settings and is not commonly used in formal or professional contexts.
Combination of お兄ちゃん (onīchan, meaning 'older brother') and 子 (ko, meaning 'child').
This term is commonly used in informal family contexts, especially by younger siblings when referring to their older brother's child.