Intravenous means going directly into a vein. An intravenous drip.
It is the fastest route into the body, since nothing has to be absorbed first. Intravenous fluids are the single most useful thing in most emergencies.
1adjectiveintravenousGoing directly into a vein.
“The intravenous antibiotics worked within about six hours.”
intravenous is a quality.
From intra- + venous.
Etymology from Wiktionary, CC BY-SA