Definition of Neapolitan mandolin in English:

Neapolitan mandolin

(also mandolino)

noun

Music
  • The original and more common type of mandolin (usually referred to without qualification as a mandolin), having four (or occasionally five) pairs of strings which fasten at the lower end of its body, and a neck which is attached to its body rather than being a continuation of it.

Origin

1940s; earliest use found in Willi Apel (b. 1893).