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2.
the Japanese word for "older brother" (younger brother is itouto).
Kiyoshi is my oniichan, Wakana is my oneechan.
by MishaMassacre August 15, 2007
 
1.
Onee-chan is Japanese for older brother.

"Good morning, Onii-chan"
by Odelia November 04, 2007
 
3.
Means sister or brother.
Kotomi: Nuu Onii-Chan
by corakc November 11, 2009