The crossword solution for the term 'hot dog ingredient' is NITRATE, which is a seven-letter word. NITRATE is a type of salt that is used as a preservative in processed meats such as hot dogs. It is also used to add flavor and color to the food. NITRATE is a naturally occurring compound found in soil and water, but it can also be produced synthetically. In high concentrations, NITRATE can be toxic, so it is important to use it in moderation.