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Longman Dictionary of Contemporary English
open sandwich
noun
EXAMPLES FROM CORPUS
▪ Tabled'hôte lunch and open sandwich lunches also available.
Wiktionary
open sandwich

n. Any dish consisting of only one slice of bread, with any topping.

WordNet
open sandwich

n. sandwich without a covering slice of bread [syn: open-face sandwich]

Wikipedia
Open sandwich

An open sandwich, also known as an open face/faced sandwich or tartine consists of a single slice of bread with one or more food items on top.