_Ordinary_: See _Physician in ordinary_.
_Oil of Vitriol_: (sulphuric acid, or vitriolic acid,) an acid composed
of oxygen and sulphur.
_Oino-mania_: A disease of the brain produced by excessive use of
alcoholic stimulants; derived from two Greek words, _oinos_, wine, and
_mania_, madness. The same disease sometimes arises from overuse of
tobacco and other stimulants of the nerves.
_Orleans, (Elizabeth Charlotte de Baviere) Duchess of_: Second wife of
Philippe, the brother of Louis XIV., was born at Heidelberg, May 26th,
1652, and died at the palace of St. Cloud, in Paris, December 8th, 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 of a substance with oxygen, though not enough
oxygen to produce an acid; for example, oxide of iron, or rust of
metals.
_Oxidize_: To combine oxygen with a body without producing acidity.
_Oxygen_: The vital element of air, a simple and very important
substance which exists in the atmosphere and supports the breathing
of animals and the burning of combustibles.
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