(anatomy, dated) The gallbladder.

(uncountable) A feeling of exasperation.

(uncountable) Impudence or brazenness; temerity, chutzpah.

(countable) A sore on a horse caused by an ill-fitted or ill-adjusted saddle; a saddle sore.

(countable) A pit on a surface being cut caused by the friction between the two surfaces exceeding the bond of the material at a point.

(anatomy, obsolete, uncountable) Bile, especially that of an animal; the greenish, profoundly bitter-tasting fluid found in bile ducts and gall bladders, structures associated with the liver.

(uncountable, obsolete) Great misery or physical suffering, likened to the bitterest-tasting of substances.

(medicine, obsolete, countable) A sore or open wound caused by chafing, which may become infected, as with a blister.

(countable, phytopathology) A blister or tumor-like growth found on the surface of plants, caused by burrowing of insect larvae into the living tissues, especially that of the common oak gall wasp Cynips quercusfolii.

(Can we clean up(+) this sense?) (countable) A bump-like imperfection resembling a gall.

(transitive) To bother or trouble.

To harass, to harry, often with the intent to cause injury.

To chafe, to rub or subject to friction; to create a sore on the skin.

To exasperate.

To cause pitting on a surface being cut from the friction between the two surfaces exceeding the bond of the material at a point.

To scoff; to jeer.

To impregnate with a decoction of gallnuts in dyeing.