A monstrous growth of part of the plant resulting from puncture by a parasitic insect, bacteria, fungi or eelworm mites; often containing insect larva(e) and then often characteristic in shape according to the insect and the plant species involved.
A swelling on a plant, such as those resulting when an insect or mite lays eggs in a twig, leaf, or branch.
An abnormal, usually inflated growth on a plant caused by an insect.
A particularized propagation of flora fabric inducing a protuberance or excrescence, typically obtaining a distinguishing configuration, dissimilar to any part of the regular vegetation. Galls are commonly instituted in reply to the effect of a disease-causing agent or vermin.