(chemistry) A hypothetical sulphacid analogous to arsenious acid, and known only in its salts.

(chemistry) mellitic acid

(biochemistry) An acid found in the muscles after prolonged contraction.

(organic chemistry, dated) A purple semifluid substance said to be obtained from archil.

(inorganic chemistry) Any oxyacid of sulfur of the form H₂SₙO₆ (examples are known having n from 2 to 6) / (organic chemistry) Any thiocarboxylic acid

(inorganic chemistry) Either of two acids formally derived from sulfuric acid by replacing a -OH group with a -OOH group.

(inorganic chemistry) The compound HAuCl₄ obtained by dissolving gold in aqua regia

(biochemistry) Any of several related derivatives of gluconic acid that have some characteristics of a vitamin

(chemistry) hydrogen selenide, regarded as an acid analogous to sulphydric acid

(organic chemistry) An acid excreted in the urine after consumption of phenylacetic acid.