articular
  Relating to joints:  the articular surfaces of bones.

asafetida (asafoetida)
  Fetid (offensive odor) gum resin of Asian plants of the genus Ferula
  (especially F. assafoetida, F. foetida, or F. narthex).  It has a strong
  odor and taste, and was formerly used as an antispasmodic and a general
  prophylactic against disease.

atresia
  Absence or closure of a normal body orifice or tubular passage such as
  the anus, intestine, or external ear canal.  Degeneration and resorption
  of one or more ovarian follicles before a state of maturity has been
  reached.

atropine
  Poisonous, bitter, crystalline alkaloid, C17H23no3, obtained from
  belladonna and related plants.  Used to dilate the pupils of the eyes and
  as an antispasmodic.

bainmarie
  Large pan of hot water in which smaller pans may be placed to cook food
  slowly or to keep food warm.

barberry
  Shrubs of the genus Berberis having small yellow flowers, and red,
  orange, or blackish berries.

baryta
  A barium compounds, such as barium sulfate.

baste
  Sew loosely with large running stitches to hold together temporarily.

batiste
  Fine, plain-woven fabric made from various fibers and used especially
  for clothing.

bedizen
  Ornament or dress in a showy or gaudy manner.

belladonna (deadly nightshade)
  Poisonous Eurasian perennial herb (Atropa belladonna) with solitary,
  nodding, purplish-brown, bell-shaped flowers and glossy black berries. 
  An alkaloidal extract of this plant used in medicine.

benne (sesame)
  Tropical Asian plant (Sesamum indicum) bearing small flat seeds used as
  food and as a source of oil.

benzoin
  Balsamic resin obtained from certain tropical Asian trees of the genus
  Styrax and used in perfumery and medicine.  Also called benjamin, gum
  benjamin, gum benzoin.  A white or yellowish crystalline compound, C14
  H12 O2, derived from benzaldehyde.

berberine
  Bitter-tasting yellow alkaloid, C20H19no5, from several plants such as
  goldenseal.  Used medically as an antipyretic and antibacterial agent.

bergamot
  Small tree (Citrus aurantium subsp. bergamia) grown in southern Italy
  for its sour citrus fruits.  The rinds yield an aromatic oil (bergamot
  oil) used in perfume.

beri-beri
  Deficiency of thiamine, endemic in eastern and southern Asia and
  characterized by neurological symptoms, cardiovascular abnormalities,
  and edema.

Berserker
  Ancient Norse warriors legendary for working themselves into a frenzy
  before a battle and fighting with reckless savagery and insane fury.

bijouterie
  Collection of trinkets or jewelry; decorations.

bilious
  Relating to bile.  Excess secretion of bile.  Gastric distress caused by a
  disorder of the liver or gallbladder.  Resembling bile, especially in
  color:  a bilious green.  Peevish disposition; ill-humored.