(biochemistry) The aldaric acid, 2,3 dihydroxy-succinic acid, that occurs naturally in many plants, in wine and in tamarind; it is used as the salts cream of tartar and Rochelle salt.

(chemistry) a weak acid, either of two hydrated forms of titanium dioxide, H₂TiO₃ or H₄TiO₄; used as a mordant

(chemistry) A poisonous unstable liquid, HSCN; its salts and esters, the thiocyanates, have a variety of uses.

(organic chemistry) Any of the three isomers ortho-, meta- and para- methylbenzoic acid, derived from toluene.

(inorganic chemistry) One of several systematic acid names for water, H₂O.

(inorganic chemistry) The weak acid, H₂SO₃, present in a solution of sulfur dioxide in water; it is a reducing agent and mild bleach.

(chemistry) the hydrated form of tantalum oxide, Ta₂O₅

(chemistry) The hydrated form of tellurium oxide, H₆TeO₆, with some use as a reagent.

(chemistry) any of various hydrated forms of vanadium pentoxide

(chemistry) the solid hydrated form of tungsten oxide, H₂WO₄; used in textiles, and in yellow glazes