quercitannic

[Lat. querc ( us )=an oak; i connect., and Eng. tannic.] Derived from or containing tannic acid. quercitannic-acid, s. Chem.: An acid of unknown composition, found in oak-galls. It somewhat resembles gallotannic acid, but is not converted into pyrogallic acid by dry distillation. Sulphuric acid precipitates it in red flocks. quer-çite, s. [Latin querc ( us )=an oak; Eng. suff.- ite.] Chem.: C6H12O5. Quercin. Quercitol. Sugar of acorns. A saccharine substance obtained from the aqueous extract of bruised acorns. It crystallizes in transparent, monoclinic prisms, which are permanent in the air; melts at 235°, and is soluble in water and hot dilute alcohol. Hot nitric acid converts it into oxalic acid; but a mixture of nitric and sulphuric acids changes it into a white amorphous resin, nitroquercite, which is insoluble in water, but soluble in hot alcohol.