Source : Webster's Revised Unabridged Dictionary (1913)

   {Oil gas}, inflammable gas procured from oil, and used for
      lighting streets, houses, etc.

   {Oil gland}.
   (a) (Zo["o]l.) A gland which secretes oil; especially in
       birds, the large gland at the base of the tail.
   (b) (Bot.) A gland, in some plants, producing oil.

   {Oil green}, a pale yellowish green, like oil.

   {Oil of brick}, empyreumatic oil obtained by subjecting a
      brick soaked in oil to distillation at a high temperature,
      -- used by lapidaries as a vehicle for the emery by which
      stones and gems are sawn or cut. --Brande & C.

   {Oil of talc}, a nostrum made of calcined talc, and famous in
      the 17th century as a cosmetic. [Obs.] --B. Jonson.

   {Oil of vitriol} (Chem.), strong sulphuric acid; -- so called
      from its oily consistency and from its forming the
      vitriols or sulphates.

   {Oil of wine}, [OE]nanthic ether. See under {[OE]nanthic}.

   {Oil painting}.
   (a) The art of painting in oil colors.
   (b) Any kind of painting of which the pigments are originally
       ground in oil.

   {Oil palm} (Bot.), a palm tree whose fruit furnishes oil,
      esp. {El[ae]is Guineensis}. See {El[ae]is}.

   {Oil sardine} (Zo["o]l.), an East Indian herring ({Clupea
      scombrina}), valued for its oil.

   {Oil shark} (Zo["o]l.)
   (a) The liver shark.
   (b) The tope.

   {Oil still}, a still for hydrocarbons, esp. for petroleum.

   {Oil test}, a test for determining the temperature at which
      petroleum oils give off vapor which is liable to explode.
      

   {Oil tree}. (Bot.)
   (a) A plant of the genus {Ricinus} ({R. communis}), from the
       seeds of which castor oil is obtained.
   (b) An Indian tree, the mahwa. See {Mahwa}.
   (c) The oil palm.

   {To burn the midnight oil}, to study or work late at night.
      

   {Volatle oils}. See {Essential oils}, under {Essential}.