The Collaborative International Dictionary of English v.0.48:

Inject \In*ject"\, 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]

            C[ae]sar 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]