gall midge

plural of gall mite

A gall that develops on the pedunculate oak, induced by the wasp Andricus quercuscalicis.

The gall produced by the leaves of the Aleppo oak, Quercus infectoria, in response to the larvae of a species of gall wasp, Cynips quercusfolii, and which has been harvested for thousands of years as a concentrated source of tannins for use in high-quality inks, in medicine, etc.

plural of gall gnat

(idiomatic) bitterness and resentment

A defect in timber, caused by damage to the bark of the young tree.

A cup-shaped gall in oak leaves.

A watery appearance in the sky, accompanying a rainbow. / A pit or cavity made by a torrent of water.

A small gall.