An abnormal formation. / (teratology) An abnormal developmental feature of offspring.

plural of malformation

Not formed correctly; misshapen; deformed.

That creates malformations

plural of malformity

deviation or mistake in form; deformity

(pathology) A congenital disorder in which arteries are connected directly to veins rather than through capillaries that distribute oxygen and nutrients. These connections, often called a nidus, can be extremely fragile and prone to bleeding.

plural of Chiari malformation

(teratology) A malformation of the brain, consisting of a downward displacement of the cerebellar tonsils through the foramen magnum, sometimes causing hydrocephalus.

plural of arteriovenous malformation