Meaning of -FREE in English

-FREE

~ combines with nouns to form adjectives that indicate that something does not have the thing mentioned, or has only a little of it. For example, sugar~ drinks do not contain any sugar, and lead~ petrol is made using only a small amount of lead.

...a salt~ diet.

COMB in ADJ

Collins COBUILD.      Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) .