hydracid

from The Century Dictionary.

• noun In chem., a halogen; an acid which does not contain oxygen.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) An acid containing hydrogen; -- sometimes applied to distinguish acids like hydrochloric, hydrofluoric, and the like, which contain no oxygen, from the oxygen acids or oxacids. See acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry An acid that does not contain any oxygen as opposed to an oxyacid; they are all binary compounds of hydrogen and a halogen or pseudohalogen.