Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «B»:
Birth defect: Any defect present in a baby at birth, irrespective of whether the defect is caused by a genetic factor or by prenatal events that are not genetic.
Birth defects may involve many different organs including the brain, heart, lungs, liver, bones, and intestinal tract. These defects ca...
Birth defects, study of
Birth defects, study of: The study of birth defects is now usually called dysmorphology.
Dysmorphology is a term coined by Dr. David W. Smith in the 1960's to describe the study of human congenital malformations (birth defects), particularly those affecting the morphology (the anatomy) of the indivi...
Birth rate: The birth rate is usually given as the
number of live births divided by the average population (or the population at midyear).
This is termed the crude birth rate. In 1995, for example, the crude birth rate per 1,000
population was 14 in the United States, 16.9 in Australia, etc. ...
Birthmark: A persistent visible mark on the skin that is evident at birth or shortly thereafter. A birthmark is often due to a nevus (a mole) or an hemangioma (a localized collection of small blood vessels).
Birthmarks that are pink or red are commonly capillary hemangiomas -- collections of tiny b...
bis in die (on prescription)
bis in die (on prescription): Seen on a prescription, bid means
twice (two times) a day. It is
an abbreviation for "bis in die" which in Latin means twice
a day. The
abbreviation bid is sometimes written without a period
lower-case letters as "bid" or in capital letters as
"BID" or wit...
Bisexual: An individual who engages in both heterosexual and homosexual sexual relations. Bisexual can also refer to the corresponding lifestyle.
In physical biology, the term "bisexual" refers to an individual who was born with gonadal tissue of both sexes (that, both testicular and ovarian tissue)...
Bisexual suicide risk
Bisexual suicide risk: High rates of suicide have consistently been reported among homosexuals, particularly among adolescents and young adults. A 1989 report concluded that "gay youth are 2 to 3 times more likely to attempt suicide than other young people. They may comprise up to 30% of completed y...
Bisphosphonate: A class of drugs used to strengthen bone. Bone is in a constant state of remodeling, whereby new bone is laid down by cells called osteoblasts while old bone is removed by cells called osteoclasts. Bisphosphonates inhibit bone removal (resorption) by the osteoclasts. Bisphosphonates ...
Biventricular assist device
Biventricular assist device: A ventricular assist device that helps both ventricles of the heart. It helps the right ventricle of the heart to pump blood to the lungs and the left ventricle to pump blood to the body. The Berlin Heart is an example of a biventricular assist device....
BKA: Acronym standing for "below knee amputation." A nurse scrubbing for a BKA is preparing to assist in a below-knee amputation.
BKA is as opposed to AKA (above knee amputation)....
Black American: See: African American....
Black Death: The Medieval black plague that ravaged Europe and killed a third of its population. It was due to the plague which is caused by a bacterium (Yersinia pestis) transmitted to humans from infected rats by the oriental rat flea.
Europe, the victims of the Black Death had ...
Black eye: Bruising of the eyelid and/or under-
eye area as a result of trauma to the eye. Colloquially
called a shiner....
Black henna: A tattoo ink and paste consisting of henna with other ingredients added, sometimes including para-phenylenediamine (PPD). Allergic reactions to PPD include a red rash, contact dermatitis, itching, blisters, open sores, scarring of the skin and other potentially harmful effects. Allergic...
Black lung disease
Black lung disease: A chronic occupational lung disease contracted by the prolonged breathing of coal mine dust. The silica and carbon in the coal dust cause black lung disease. About one of every 20 miners studied in the US has X-ray evidence of black lung disease, a form of pneumoconiosis.