The Collaborative International Dictionary
Neapolitan ice \Ne`a*pol"i*tan ice\, Neapolitan ice cream \Neapolitan ice cream\
An ice or ice cream containing eggs as well as cream.
An ice or ice cream prepared in layers, as vanilla, strawberry, and chocolate ice cream, and orange or lemon water ice.
Wikipedia
Neapolitan ice cream, sometimes known as harlequin ice cream, is made up of blocks of vanilla, chocolate, and strawberry ice cream side by side in the same container (typically with no packaging in between). Some brands intermix the flavors more, though the separate flavors are still clearly visible.
Neapolitan ice cream was named in the late 19th century as a reflection of its presumed origins in the cuisine of the Italian city of Naples, and the many Neapolitan immigrants who brought their expertise in frozen desserts with them to the United States. Spumoni was introduced to the United States in the 1870s as Neapolitan-style ice cream. Early recipes used a variety of flavors; however, the number of three molded together was a common denominator, to resemble the Italian flag (cf. insalata tricolore). More than likely, chocolate, vanilla, and strawberry became the standard for the reason that they were the most popular flavors in the United States at the time of introduction.
Usage examples of "neapolitan ice cream".
Instead he scooped a large dishful of Neapolitan ice cream for himself and a spoonful for the Siamese.
Even the grandest mansions seemed to shimmer and soften in the filthy heat, melting columns of Neapolitan ice cream garnished with marzipan palms.
The freezer held a lonesome Swanson turkey pot pie and a partially consumed half gallon of Neapolitan ice cream with freezer-frost thick on the lid.
He was drinking whiskey straight from the bottle and eating Neapolitan ice cream straight from the tub.