Category: D

The act of becoming darker in colour.  

A drug which is harmful and is not available to the general public, e.g. morphine or heroin. A poison which can only be sold to specific persons.  

The possibility of harm or death.  

A congenital condition in which there is no Magendie’s foramen in the brain. A congenital brain malformation characterized by fourth ventricle (posterior fossa) cystic dilation, hydrocephalus, and improper formation of the cerebellar vermis.  

Very small fragments that fall from the feathers, hair or skin of animals or people. Small scales from animal skins or hair or bird feathers, which may cause an allergic reaction in some persons. Small scales from the skin, hair, or feathers of animals, which may provoke allergic reactions in sensitized individuals. Dander refers to…

The commonest form of colour blindness, in which someone cannot see the difference between red and green. Also called protanopia [Described 1794. After John Dalton (1766-1844), English chemist and physician. Founder of the atomic theory, he himself was colour-blind.] Sex-linked, inherited form of color blindness characterized by inability to distinguish red from green. A defect…

A condition in which a person has longer fingers than usual. Abnormally large fingers and/or toes.  

Signs made with the fingers in place of words when talking to a person who is unable to hear, or when a person who is unable to hear or speak wants to communicate. The representation of speech by finger movements: deaf and dumb language. Any of the techniques of communicating by use of the fingers…

Inflammation of the fingers or toes, caused by bone infection or rheumatic disease. Inflammation of the fingers or toes, resulting in a sausage shaped appearance of the digits. Dactylitis is a common finding in reactive arthritis. Dactylitis refers to the inflammation of the fingers or toes, and it can occur in individuals with sickle cell…

A benign swelling in one of the tear ducts.