A frozen flavoured refreshment or dessert made with water and sugar, and typically no dairy ingredients.

U.S., Caribbean, and Bermudian English. Shaved or chipped ice flavoured with (brightly-coloured) syrup; (as count noun) a portion of this.ⓘ

In Hawaii: a frozen dessert or refreshment made with finely-shaved ice and flavoured syrup or other sweet ingredients, typically served in a paper…

(see quot. 1969); also attributive.