also: ねはんにしかぜ
noun
wind on the day of Buddha's death memorial service
Buddhist term for the wind that blows on the day of the Nehan-e (涅槃会) service, held on the 15th day of the 2nd month in the traditional calendar. Rare and highly domain-specific.
涅槃西風は、涅槃会の日に吹く風を指す仏教用語です。
Nehan-nishi is a Buddhist term for the wind that blows on the day of the Nehan-e service.
From 涅槃 (nehan, 'Nirvana', referring to Buddha's death) and 西風 (nishi, 'west wind'). The exact origin of the association is uncertain, but it is a traditional Buddhist term.