mouth organ

noun
1.
harmonica (def 1).
Origin
1660-70
Examples from the web for mouth organ
  • The handles of some of them contain a pep gun and in ethers a mouth organ.
  • The awkward looking animal played en a mouth organ, but aside from that did everything but what it was told.
British Dictionary definitions for mouth organ

mouth organ

noun
1.
another name for harmonica (sense 1)