Other forms: injected, injecting, injects
To inject is to push liquid in through a needle. Inject the drug, injected into the muscle, inject insulin.
The routes have names: intravenous into a vein, intramuscular into a muscle, subcutaneous under the skin. Figuratively, to inject is to introduce something needed: inject energy into a room, inject money into a scheme, inject some humour. In computing, injection means inserting malicious input — SQL injection is one of the oldest and commonest attacks. Note injection, and injector.
1verbinjectTo push liquid in through a needle.
“The dose is injected into the muscle about once a fortnight.”
2verbintroduceTo introduce something needed into a situation.
“The new coach injected some much-needed energy into the team.”
inject is a putting in.
Latin iniectus comes from inicere — in- plus iacere, to throw. The same iacere gives project, reject and eject, so injecting something is throwing it in.
Proto-Indo-European
*(H)yeh₁-
Latin
iniectus
English, today
inject
Built from
From Latin iniectus, participle of iniciō (“to throw in”), from in- + iaciō.
Etymology from Wiktionary, CC BY-SA