v. t. [ imp. & p. p. Injected; p. pr. & vb. n. Injecting. ] [ L. injectus, p. p. of inicere, injicere, to throw in; pref. in- in + jacere to throw: cf. F. injecter. See Jet a shooting forth. ] [ 1913 Webster ]

1. To throw in; to dart in; to force in; as, to inject cold water into a condenser; to inject a medicinal liquid into a cavity of the body; to inject morphine with a hypodermic syringe. [ 1913 Webster ]

2. Fig.: To throw; to offer; to propose; to instill. [ 1913 Webster ]

Cæsar also, then hatching tyranny, injected the same scrupulous demurs. Milton. [ 1913 Webster ]

3. To cast or throw; -- with on. [ R. ] [ 1913 Webster ]

And mound inject on mound. Pope. [ 1913 Webster ]

4. (Anat.) To fill (a vessel, cavity, or tissue) with a fluid or other substance; as, to inject the blood vessels. [ 1913 Webster ]

5. to add in; to insert; to interject; as, to inject a comment into the conversation; to inject humor into a tense situation. [ PJC ]

adj. 1. capable of being conveniently injected; -- used of drug preparations, such as sterile lyophilize medicine in a serum-capped vial. Opposite of uninjectable. [ WordNet 1.5 +PJC ]

2. Requiring injection for administration; -- of drugs, especially those not active by oral administration. Opposite of orally active. [ PJC ]

n. [ L. injectio : cf. F. injection. ] 1. The act of injecting or throwing in; -- applied particularly to the forcible insertion of a liquid or gas, by means of a syringe, pump, etc. [ 1913 Webster ]

2. That which is injected; especially, a liquid inserted thrown into a cavity of the body by a syringe or pipe; a clyster; an enema. Mayne. [ 1913 Webster ]

3. (Anat.) (a) The act or process of filling vessels, cavities, or tissues with a fluid or other substance. (b) A specimen prepared by injection. [ 1913 Webster ]

4. (Steam Eng.) (a) The act of throwing cold water into a condenser to produce a vacuum. (b) The cold water thrown into a condenser. [ 1913 Webster ]

Injection cock, or
Injection valve (Steam Eng.), the cock or valve through which cold water is admitted into a condenser. --
Injection condenser. See under Condenser. --
Injection pipe, the pipe through which cold water is through into the condenser of a steam engine. --
fuel injection, a method of inserting fuel into internal-combustion engines by directly forcing the liquid fuel into the combustion chamber at an appropriate point in the piston cycle; in contrast to carburetion, in which an air-fuel mixture is drawn in by the downward stroke of the piston. [ 1913 Webster +PJC ]

n. 1. One who, or that which, injects. [ 1913 Webster ]

2. (Mach.) A contrivance for forcing feed water into a steam boiler by the direct action of the steam upon the water. The water is driven into the boiler by the impulse of a jet of the steam which becomes condensed as soon as it strikes the stream of cold water it impels; -- also called Giffard's injector, from the inventor.

fuel injector, a device for actively injecting fuel into an internal-combustion engines by directly forcing the liquid fuel into the combustion chamber at an appropriate point in the piston cycle; -- an alternative to a carburetor, in which an air-fuel mixture is drawn in by the downward stroke of the piston. [ 1913 Webster ]