tr.v. in·ject·ed, in·ject·ing, in·jects
1. To force or drive (a fluid) into something: inject fuel into an engine cylinder; inject air into a liquid mixture.
a. To introduce (a drug or vaccine, for example) into a body part, especially by means of a syringe.
b. To treat by means of injection: injected the patient with digitalis.
3. To introduce into conversation or consideration: tried to inject a note of humor into the negotiations.
4. To place into circulation: inject money into the economy.
5. To place into an orbit or trajectory: inject a satellite into geosynchronous orbit.
6. Physics To cause (a beam of particles, for example) to strike a target.
[Latin inicere, iniect-, to throw in : in-, in; see IN-2 + iacere, to throw; see yē- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.