hara-kiri
Concise Oxford English Dictionary © 2008 Oxford University Press:
hara-kiri /ˌharəˈkɪri/
▶noun ritual suicide by disembowelment with a sword, formerly practised in Japan by samurai as an honourable alternative to disgrace or execution.
– origin C19: colloq. Japanese, from hara ‘belly’ + kiri ‘cutting’.
'hara-kiri' also found in these Oxford entries:

