Skip to Main Content

Battle sign

(bat′ĕl) [William Henry Battle, Brit. surgeon, 1855–1936] Ecchymosis behind the ear; a physical finding in patients with basilar skull fracture.


(bā) An anatomical recess or depression filled with liquid.

Bayes theorem

(bāz) [Thomas Bayes, Brit. mathematician, 1702–1761] A statistical theorem concerned with analyzing the probability that a patient may have a specific condition after diagnostic testing. The theorem states that if a disease is very rare (the pretest probability is low), the patient is unlikely to have that condition even with a positive diagnostic test. Conversely, when the pretest probability of a specific condition is very high, a negative test result does not rule out the condition.

Bayley Scales of Infant Development

(Bā′lē) A standardized evaluation used to provide information about the motor, language, and cognitive developmental status of children aged 2 to 42 months. The evaluation is based on observation of infant performance and on parental report.

Baylisascaris procyonis

(bāl″ĭ-sas′kă-rĭs prō″sē-ōn′ĭs, sē′ŏn-ĭs) [L. procyon, raccoon fr. Gr.] The raccoon roundworm. Accidental consumption of roundworm eggs (such as by children who put contaminated soil in their mouths) can result in encephalitis. SYN: raccoon ascaris.

Bazin disease

(bă-zin′) [Antoine P. E. Bazin, Fr. dermatologist, 1807–1878] A chronic skin disease occurring in young adult females; characterized by hard cutaneous nodules that break down to form necrotic ulcers that leave atrophic scars. The disease is almost invariably preceded by tuberculosis, but the etiological relationship to that disease is debated. SYN: erythema induratum.


bed bath; bowel and bladder.


bundle branch block.


baby’s blood type; basal body temperature.


branched-chain amino acids.

B-cell acute lymphoblastic leukemia-lymphoblastic lymphoma

ABBR: BALL/LBL. The most common childhood cancer. It comprises the entities previously known as acute lymphoblastic leukemia (ALL) and lymphoblastic lymphoma (LBL).

B-cell lymphoblastic leukemia-lymphoblastic lymphoma

ABBR: B-ALL/LBL. The most common childhood cancer. It comprises the entities previously known as acute lymphoblastic leukemia and lymphoblastic lymphoma.


bacille Calmette-Guérin.


One of a family of oncogenes involved in the suppression of tumors. Bcl-2 is responsible for some of the ability of certain tumors to elude the host organism’s defenses. Bcl-2 suppresses apoptosis, permitting the metastasis of tumors. SEE: apoptosis; oncogene.


body dysmorphic disorder.


(dĕl″ō-vĭb′-rē-ō″) [Gr. bdello, leech, + vibrio...

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.