What is the meaning of Piccalilli?

A yellow pickle relish made from cauliflower, vegetable marrow, and other vegetables, pickled with vinegar, salt, sugar, and spiced with mustard, turmeric, and other spices.

A pickle, typically on a base of chopped green (unripe) tomatoes, but sometimes finely-chopped gherkins, and possibly including other vegetables.

Source: wiktionary.org