Ketchup vs. Katsup — What's the Difference?

Ketchup is a table condiment. The unmodified term ("ketchup") now typically refers to tomato ketchup, although original recipes used egg whites, mushrooms, oysters, grapes, mussels, or walnuts, among other ingredients.Tomato ketchup is a sweet and tangy condiment made from tomatoes, sugar, and vinegar, with seasonings and spices.

Archaic form of ketchup

A spicy sauce made chiefly from tomatoes and vinegar, used as a relish.

A condiment consisting of a thick, smooth-textured, spicy sauce usually made from tomatoes.

(uncountable) A tomato-vinegar-based sauce, sometimes containing spices, onion or garlic, and (especially in the US) sweeteners.

Such a sauce more generally (not necessarily based on tomatoes, but with mushrooms, fish, etc.).

(transitive) To cover with ketchup.

A pureed table sauce made predominantly from tomatoes, flavored with onions, sugar, salt and spices; called also tomato ketchup. The term is also applied to pureed sauces containing mushrooms, walnuts, etc., being called in such cases mushroom ketchup, walnut ketchup, etc.

Thick spicy sauce made from tomatoes