querc-, querci- +

(Latin: oak; used to designate any of a variety of chemical substances derived from oak bark or acorns)

A flavonol containing many hydroxyl groups, found as its glucoside in plants, including the bark of the American oak Quercus tinctoria.

It is used as a dye.

quercine: oak
Of or pertaining to the oak; made of oak, oaken.
Referring to, or designating, a tannic acid found in oak bark and extracted as a yellowish brown amorphous substance.
A white crystalline substance found in acorns, the fruit of the oak (Quercus).

It has a sweet taste, and is regarded as a pentacid (combining with, five molecules of a monobasic acid) alcohol.

A glucoside extracted from the bark of the oak (Quercus) as a bitter citron-yellow crystalline substance, used as a pigment and called quercitron.
1. The yellow inner bark of the Quercus tinctoria, the American black oak, yellow oak, dyer's oak, or quercitron oak, a large forest tree growing from Maine to eastern Texas.
2. Quercitrin, used as a pigment.
quercitron oak
A medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for tanning; broad 5-lobed leaves are bristle-tipped.
Feeding on the leaves of oak trees.
Quercus agrifolia
A highly variable, often shrubby, evergreen oak on the coastal zone of western North America having small thick usually spiny-toothed dark-green leaves.
Quercus prinus
A medium to large deciduous tree of the eastern United States.

Its durable wood is used as timber or split and woven into baskets or chair seats.

Quercus suber
A medium-sized evergreen oak of southern Europe and northern Africa having thick corky bark that is periodically stripped to yield commercial cork.
Quercus variabilis
A medium to large deciduous tree of China, Japan, and Korea having a thick corky bark.
Quercus virginiana
A medium-sized evergreen native to eastern North America to the east coast of Mexico.

Often cultivated as shade tree for its wide-spreading crown and extremely hard tough durable wood which was once used in shipbuilding.

Quercus wizlizenii
A medium-small shrubby evergreen tree of western North America similar to the coast live oak but occurring chiefly in foothills of mountain ranges removed from the coast; an important part of the chaparral.
quercus, white oak bark
The dried inner bark of Quercus alba, white oak.

It contains tannic acid, pectin, and resin, and it is used as an astringent.