A mysterious and widespread phenomenon of the sudden disappearance of colonies of bees.

(genetics, medicine) Any of a group of disorders caused by stretches of DNA that contain a sequence of three nucleotides repeated many times

(psychiatry) Any of a group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication. They are: Asperger syndrome, autism, childhood disintegrative disorder, Rett syndrome, and PDD-NOS.

(psychiatry) A rare condition characterized by deterioration of language, social function, and motor skills in a child after normal development for the child's first three years.

(psychology, pathology) A disorder involving any of a range of psychological conditions, all characterized by abnormal social interaction and communication, restricted interests, highly repetitive behaviour, and eccentricity.

A form of learning disorder, characterised by severe impairment in visual-spatial, motor and social skills. It is very similar to Asperger’s syndrome.

(psychiatry) A mental disorder characterized by the presence of two or more personality states or distinct identities that repeatedly take control of a person's behavior.

A condition in which the patient experiences significant gender dysphoria: the diagnostic classification most commonly applied to transgender/transsexual people.

(psychiatry) A mental disorder characterized by paranoia and a pervasive, long-standing suspiciousness and generalized mistrust of others.

(psychology, informal, dated) Dissociative identity disorder.