accordion; melodeon; concertina
Historical term for accordion-like instruments; in modern Japanese, アコーディオン is the common word. 手風琴 may appear in older literature or historical contexts.
In the Meiji period, accordions were imported and became popular.
There is a photo of my grandmother playing an accordion.
Compound of 手 (hand) + 風 (wind) + 琴 (stringed instrument), likely coined in the Meiji era to describe the accordion as a hand-operated wind instrument. The exact origin is uncertain.