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Definition: Volatle oils
(oil), n. [OE. oile, OF. oile, F. huile, fr. L. oleum;
akin to Gr. ?. Cf. Olive
Any one of a great variety of unctuous combustible
substances, more viscous than and not miscible with water;
as, olive oil, whale oil, rock oil, etc. They are of animal,
vegetable, or mineral origin and of varied composition, and
they are variously used for food, for solvents, for
anointing, lubrication, illumination, etc. By extension, any
substance of an oily consistency; as, oil of vitriol.
Note: The mineral oils are varieties of petroleum. See
. The vegetable oils are of two classes,
(see under Essential
), and natural oils
which in general resemble the animal oils and
fats. Most of the natural oils and the animal oils and
fats consist of ethereal salts of glycerin, with a
large number of organic acids, principally stearic,
oleic, and palmitic, forming respectively stearin,
olein, and palmitin. Stearin and palmitin prevail in
the solid oils and fats, and olein in the liquid oils.
Mutton tallow, beef tallow, and lard are rich in
stearin, human fat and palm oil in palmitin, and sperm
and cod-liver oils in olein. In making soaps, the acids
leave the glycerin and unite with the soda or potash.
, Bone oil
, Dipple's oil
, etc. (Old Chem.), a
complex oil obtained by the distillation of animal
substances, as bones. See Bone oil
, under Bone
, Essential oils
. (Chem.) See under Drying
Ethereal oil of wine
, Heavy oil of wine
. (Chem.) See
. (Chem.) See under Fixed
(Zo["o]l.), a bag, cyst, or gland in animals,
(Zo["o]l.), any beetle of the genus Meloe
allied genera. When disturbed they emit from the joints of
the legs a yellowish oily liquor. Some species possess
vesicating properties, and are used instead of
, or Oil cellar
(Mach.), a fixed box or reservoir,
for lubricating a bearing; esp., the box for oil beneath
the journal of a railway-car axle.
. See under Cake
, a stopcock connected with an oil cup. See Oil cup
(a) A paint made by grinding a coloring substance in oil.
(b) Such paints, taken in a general sense.
(b) a painting made from such a paint.
, a cup, or small receptacle, connected with a
bearing as a lubricator, and usually provided with a wick,
wire, or adjustable valve for regulating the delivery of
, a gas engine worked with the explosive vapor of
, inflammable gas procured from oil, and used for
lighting streets, houses, etc.
(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.
, 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
(a) The art of painting in oil colors.
(b) Any kind of painting of which the pigments are originally
ground in oil.
(Bot.), a palm tree whose fruit furnishes oil,
esp. El[ae]is Guineensis
. See El[ae]is
(Zo["o]l.), an East Indian herring (Clupea scombrina
), valued for its oil.
(a) The liver shark.
(b) The tope.
, a still for hydrocarbons, esp. for petroleum.
, a test for determining the temperature at which
petroleum oils give off vapor which is liable to explode.
(a) A plant of the genus Ricinus
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.
. See Essential oils
, under Essential