(medicine) An inherited, neurological disease of (mostly female) children characterized by a small head and repetitive hand movements.

(idiomatic, nuclear physics, uncountable) A hypothetical kind of catastrophic failure in which a nuclear reactor melts through the floor of its containment system and penetrates the Earth's surface, continuing downward as if (from a Western Hemispheric point of view) traveling through the planet toward China.

(neurology, pathology) A progressive condition with a combination of severe epilepsy and cerebral palsy. It is characterised by severe physical and mental retardation and partial seizures.

A psychiatric disorder in which a person feigns illness or psychological trauma in order to garner attention or sympathy.

A genetic condition in which a person is born with two X chromosomes and one Y chromosome.

(medicine) An endocrine disorder caused by high levels of cortisol in the blood.

A nontraumatic subluxation of the atlantoaxial joint caused by inflammation of the adjacent tissues.

An autoimmune disorder in which immune cells attack and destroy the exocrine glands that produce tears and saliva.

(medicine) A rare congenital disorder characterized by the reduction or absence of peroxisomes in the cells of the liver, kidneys, and brain and the inability to beta-oxidize very-long-chain fatty acids.

(medicine, medical genetics) A particular genetic condition, caused by partially or completely missing an X chromosome (monosomy), that leads to sterility and other issues.