Seidlitz
  A village in Bohemia (also Sedlitz).  Seidlitz powders, effervescing
  salts, consisting of forty grains of sodium bicarbonate, two drachms of
  Rochell salt (tartrate of potassium and sodium) and thirty-five grains
  of tartaric acid.  The powders are mixed in water, and drunk while
  effervescing, as a mild cathartic; the result resembles the natural
  water of Seidlitz.  Also Rochelle powders.

senega
  Dried root of seneca snakeroot containing an irritating saponin and was
  formerly used as an expectorant

sesquioxide
  Oxide containing three atoms of oxygen with two atoms (or radicals) of
  some other substance; thus, alumina, Al2O3 is a sesquioxide.

shirr
  Cook (unshelled eggs) by baking until set.

sinapism. 
  See mustard plaster.

sitz bath
  Bathtub shaped like a chair, used to bathe only the hips and buttocks.

slaked lime
  See lime

sling
  Drink consisting of brandy, whiskey, or gin, sweetened and usually
  lemon-flavored.

smallpox
  Contagious febrile (feverish) disease characterized by skin eruption
  with pustules, sloughing, and scar formation.  It is caused by a poxvirus
  (genus Orthopoxvirus) that is believed to exist now only in lab
  cultures.

smilax (catbrier, greenbrier)
  Slender vine (Asparagus asparagoides) with glossy foliage, greenish
  flowers, heart-shaped leaves, and bluish to black berries; popular as a
  floral decoration.

Socotrine
  Pertaining to Socotra, an island in the Indian Ocean, on the east coast
  of Africa.

sordes
  Dark brown or blackish crust-like deposits on the lips, teeth, and gums
  of a person with dehydration resulting from a chronic debilitating
  disease.

spermaceti
  White, waxy substance from the head of the sperm whale used for making
  candles, ointments, and cosmetics.

spematorrhea (spermatorrhoea)
  Involuntary discharge of semen without orgasm

spigelia (pinkroot )
  Genus of American herbs (family Loganiaceae) related to the nux vomica
  and used as anthelmintics (expel or destroy parasitic intestinal worms).

sprue
  Chronic, chiefly tropical disease characterized by diarrhea, emaciation,
  and anemia, caused by defective absorption of nutrients from the
  intestinal tract.

squill (sea onion)
  Bulbous Eurasian and African plants of the genus Scilla, having narrow
  leaves and bell-shaped blue, white, or pink flowers.  The dried inner
  scales of the bulbs used as rat poison and formerly as a cardiac
  stimulant, expectorant, and diuretic.

stephanotis
  Woody climbing plants of the genus Stephanotis, especially S. floribunda
  of Madagascar, cultivated for its showy fragrant white flowers.

staphisagria (stavesacre)
  Eurasian plant of the genus Delphinium (D. staphisagria).  Ripe seeds of
  the stavesacre contain delphinine, are violently emetic and carthartic,
  and have been used to kill head lice called also staphisagria