Ordinary, see Physician in Ordinary.
Oil of Vitriol, (sulphuric acid, or vitriolic acid,) an acid composed of oxygen and sulphur.
Orleans, (Elizabeth Charlotte de Bavière,) Duchess of, second wife of Philippe, the brother of Louis XIV., was born at Heidelberg, May 26, 1652, and died at the palace of St. Cloud, in Paris, December 8, 1722. She was author of several works; among which were, Memoirs, and Anecdotes, of the Court of Louis XIV.
Ottoman, a kind of hassock, or thick mat, for kneeling upon; so called, from being used by the Ottomans or Turks.
Oxalic acid, a vegetable acid, which exists in sorrel.
Oxide, a compound (which is not acid) of a substance with oxygen; for example, oxide of iron, or rust of metals.
Oxidize, to combine oxygen with a body without producing acidity.
Oxygen, vital air, a simple and very important substance, which exists in the atmosphere, and supports the breathing of animals and the burning of combustibles. It was called oxygen, from two Greek words, signifying to produce acid, from its power of giving acidity to many compounds in which it predominates.
Oxygenized, combined with oxygen.
Pancreas, a gland within the abdomen, just below and behind the stomach, and providing a fluid to assist digestion. In animals, it is called the sweet-bread. Pancreatic, belonging to the pancreas.