mouth organ is a noun meaning "a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole". It carries one recorded sense.
a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole
Definitions, synonyms and semantic relations for mouth organ come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.