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Wiktionary
potato salad

n. A salad made from chopped boiled potatoes and a variety of other ingredients in a dressing

WordNet
potato salad

n. any of various salads having chopped potatoes as the base

Wikipedia
Potato salad

Potato salad is a dish made from boiled potatoes that comes in many versions in different regions of the world.

It is a popular menu choice of cooks preparing food for a large number of people, because it is easily made in large quantities, can be prepared in advance then refrigerated until needed, and requires inexpensive ingredients.