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.


Sorry, no etymologies found.


  • If for the oxacid a hydracid be substituted (927.), -- as one analogous to the muriatic, for instance, -- then the state of things changes altogether, and a current due to the chemical action of the acid on the base is possible.

    Experimental Researches in Electricity, Volume 1


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