African American: An American of black African descent. The term may also be written with a hyphen as African-American.
The term entered into usage largely starting in 1988, when the Rev. Jesse Jackson held a news conference to urge Americans to use it to refer to blacks. African American has largely supplanted black in health matters. For example, “Breast cancer tumors in African-American women are more aggressive than tumors in white women.”
The term has been a subject of debate, in part because it is ambiguous. It might be limited to Africans who have immigrated to America or to people born to one African and one American parent. Some have argued that the term African American should refer only to the descendents of slaves brought from Africa to America.
- African sleeping sickness
African sleeping sickness: Also called African trypanosomiasis, a systemic disease caused by the parasite Trypanosoma brucei that is transmitted by the bite of the tsetse fly, a gray-brown insect about the size of a honeybee. African trypanosomiasis is confined to tropical Africa from north of South Africa to south of Algeria, Libya, and Egypt. Tsetse […]
- African tapeworm
African tapeworm: Taenia saginata, the beef tapeworm, is the most common of the big tapeworms that parasitizes people, contracted from infected raw or rare beef. Can grow to be 12-25 feet (3.6-7.5 m) long in the human intestine.
- African tick typhus
African tick typhus: One of the tick-borne rickettsial diseases of the eastern hemisphere, similar to Rocky Mountain spotted fever, but less severe, with fever, a small ulcer (tache noire) at the site of the tick bite, swollen glands nearby (satellite lymphadenopathy), and a red raised (maculopapular) rash. Also called fievre boutonneuse.
Afterbirth: The placenta and fetal membranes that are expelled from the uterus following the baby’s birth. Hence, the “afterbirth.” The placenta is what joins the mother and fetus. It also permits the flow of oxygen and nutrients to the fetus besides the release of carbon dioxide and waste products from the fetus to the mother. […]
Agammaglobulinemia: Total or near-total absence of infection-fighting antibodies belonging to the class called gamma globulins. Agammaglobulinemia can be due to certain genetic diseases or caused by acquired diseases, including AIDS.