verb (used with object)
to force (a fluid) into a passage, cavity, or tissue: to inject a medicine into the veins.
to introduce (something new or different): to inject humor into a situation.
to introduce arbitrarily or inappropriately; intrude.
to interject (a remark, suggestion, etc.), as into conversation.

1590–1600; < Latin injectus past participle of in(j)icere to throw in, equivalent to in- in-2 + -jec- (combining form of jac- throw) + -tus past participle suffix

reinject, verb (used with object)
uninjected, adjective Unabridged


(in prescriptions) an injection.

< Latin injectiō Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inject (ɪnˈdʒɛkt)
1.  med to introduce (a fluid) into (the body of a person or animal) by means of a syringe or similar instrument
2.  (foll by into) to introduce (a new aspect or element): to inject humour into a scene
3.  to interject (a comment, idea, etc)
4.  to place (a rocket, satellite, etc) in orbit
[C17: from Latin injicere to throw in, from jacere to throw]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from L. injectus, pp. of injicere "to throw in or on," from in- "in" + -icere, comb. form of jacere "to throw." Injection "forcing a fluid into a body" (with a syringe, etc.) is recorded from 1540s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

inject in·ject (ĭn-jěkt')
v. in·ject·ed, in·ject·ing, in·jects

  1. To introduce a substance, such as a drug or vaccine, into a body part.

  2. To treat by means of injection.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Because digestive juices break down insulin, diabetics must inject it directly
  into the bloodstream.
Inject a few raisins of conversation into the tasteless dough of existence.
And once again, the show did an admirable job of pausing the action now and
  again to inject some science.
Others have tried to inject compressed air into the stream.
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