Hydracid is a term used to describe acids that contain hydrogen and a non-metallic element. However, there are several synonyms for hydracid, including binary acid, non-oxo acid, and protonic acid. Binary acid refers to an acid that consists of two elements, usually hydrogen and a halogen, while non-oxo acid describes an acid that doesn't contain oxygen. Protonic acid is a term used to describe acids that can donate protons. These synonyms are often used interchangeably and can be applied to a variety of acids, including hydrochloric acid, hydrofluoric acid, and hydrosulfuric acid.