bistort
  Eurasian perennial herb (Polygonum bistorta) with cylindrical spikes of
  pink flowers and a rhizome used as an astringent in folk medicine.

blue flag
  Several irises with blue or blue-violet flowers, especially Iris
  versicolor of eastern North America.

blue stone (blue vitriol, blue copperas, chalcanthite)
  Hydrated blue crystalline form of copper sulfate.

bobbinet
  Machine-woven net fabric with hexagonal meshes.

boil
  Painful, circumscribed pus-filled inflammation of the skin and
  subcutaneous tissue usually caused by a local staphylococcal infection. 
  Also called furuncle.

bolster
  Long narrow pillow or cushion.

bombazine
  Fine twilled fabric of silk and worsted or cotton, often dyed black for
  mourning clothes.

boracic acid (boric acid)
  Water-soluble white or colorless crystalline compound, H3Bo3, used as an
  antiseptic and preservative.

boutonniere
  Flower or small bunch of flowers worn in a buttonhole.

bryonia
  Small genus of perennial old world tendril-bearing vines (family
  Cucurbitaceae) having large leaves, small flowers, and red or black
  fruit; Dried root of a bryony (Bryonia alba or B. dioica) used as a
  cathartic.

bubo (buboes)
  An inflamed, tender swelling of a lymph node, especially in the area of
  the armpit or groin, that is characteristic of bubonic plague and
  syphilis.

bubonic plague (black death)
  Contagious, often fatal epidemic disease caused by the bacterium
  Yersinia (syn.  Pasteurella) pestis, transmitted from person to person or
  by the bite of fleas from an infected rodent, especially a rat; produces
  chills, fever, vomiting, diarrhea, and the formation of buboes.

buchu
  South African shrubs of the genus Agathosma, especially A. betulina and
  A. crenulata; the leaves are used as a mild diuretic and provide an
  aromatic oil used for flavoring.

burdock
  Weedy, chiefly biennial plants of the genus Arctium.

cachexia
  Weight loss, wasting of muscle, loss of appetite, and general debility
  during a chronic disease.

cajeput (paperbark)
  Australian and southeast Asian tree (Melaleuca quinquenervia, M.
  leucadendron) of the myrtle family (Myrtaceae); yields a pungent
  medicinal oil; grown in Florida.

calamine
  White or colorless mineral, essentially Zn4Si2O7(Oh)2.H2O
  (hemimorphite).  Pink, odorless, tasteless powder of zinc oxide with a
  small amount of ferric oxide, dissolved in mineral oils and used in skin
  lotions.

calcareous
  Composed of calcium carbonate, calcium, or limestone; chalky.

cale
  Variety of cabbage in which the leaves do not form a head, being nearly
  the wild form of the species; also called kail.