steppage
  Peculiar gait seen in neuritis of the peroneal nerve and in tabes
  dorsalis; high stepping to allow the drooping foot and toes to clear the
  ground.

stertorous
  Harsh snoring or gasping sound.

stevia
  Plant of the genus Stevia or Piqueria, having white or purplish
  flowers.

stiletto
  Small dagger with a slender, tapering blade.  Small, sharp-pointed
  instrument used for making eyelet holes in needlework.

stillingia
  Genus of widely distributed herbs and shrubs (family Euphorbiaceae).  The
  dried root of a plant of the genus Stillingia (S. sylvatica) was
  formerly used as a diuretic, and laxative.

stomachic
  Relating to the stomach; gastric.  Beneficial to digestion.  An agent that
  strengthens the stomach.

strychnine
  Extremely poisonous white crystalline alkaloid, C21H22O2N2, derived from
  nux vomica and related plants, used to poison rodents and topically in
  medicine as a stimulant for the central nervous system.

stupe
  Hot, wet, medicated cloth used as a compress.

St. Vitus’ Dance
  See chorea

stye (hordeolum)
  Inflamed swelling of a sebaceous gland at the margin of an eyelid.

suety
  Consisting of, or resembling, suet (hard fatty tissues around the
  kidneys of cattle and sheep, used in cooking and for making tallow.)

sugar of lead
  lead acetate, a poisonous white crystalline compound, Pb(C2H3O2)2.3H2O,
  used in hair dyes, waterproofing compounds, and varnishes.

sumbul
  Root of a plant of the genus Ferula (F. sumbul); formerly a tonic and
  antispasmodic.

Summer complaint (summer diarrhea)
  Diarrhea of children that in hot weather; often caused by ingestion of
  food contaminated by microorganisms.

Sulphonal
  Produced by combining mercaptan and acetone; employed as a hypnotic.

sulphuric ether
  Ethyl ether; formerly called Naphtha vitrioli (naphtha of vitriol).

sumac (sumach)
  Shrubs or small trees of the genus Rhus, having compound leaves,
  clusters of small greenish flowers, and usually red, hairy fruit.  Some
  species, such as the poison ivy and poison oak, cause an acute itching
  rash on contact.

suppuration
  Formation or discharge of pus.  Also called pyesis, pyopoiesis, pyosis.

suprarenal
  Located above the kidney; a suprarenal part, especially an adrenal
  gland.

sweet william
  Annual, biennial, or perennial herb (Dianthus barbatus), native to
  Eurasia, widely cultivated as an ornamental for its flat-topped dense
  clusters of varicolored flowers.

synechia
  Adhesions between the iris and the lens or cornea caused by trauma or
  eye surgery or as a complication of glaucoma or cataracts; may cause
  blindness