The Collaborative International Dictionary
Polytungstic acid
Polytungstic \Pol`y*tung"stic\, a. (Chem.) Containing several tungsten atoms or radicals; as, polytungstic acid.
Polytungstic acid (Chem.), any one of several complex acids of tungsten containing more than one atom of tungsten.
Wiktionary
polytungstic acid
n. (context obsolete chemistry English) Any of several complex acids containing multiple atoms of tungsten