veno-, ven-, veni-, vene-, -venous, -venously

(Latin: veins, vessels)

arteriovenous fistula
1. The surgical joining of an artery and a vein under the skin for the purpose of hemodialysis.
2. An abnormal connection or passageway between an artery and a vein.
intravenous (adjective)
1. Within or administered by means of a vein; such as, an injection.
2. Existing within or entering through a vein or veins.

Intravenous comes from intra-, "within" or "via", and venous, "of the veins". Often in hospitals patients will be given water or nutrients from intravenous drips from plastic bags of liquid connected to a tube going into a person's arm.

It's a way to get needed nutrition and fluid into a person's body without waiting for the digestive system to process it.

intravenously (adverb)
A reference to a dose of medicine or nutrients administered from a drip, down through a hollow needle inserted into a patient's vein; and so, in an intravenous manner: "The patient was fed intravenously because it was the fastest way to deliver fluids and medications throughout his body."

venation (s) (noun), venations (pl)
The veins or vein-like structures.
The introduction of liquid into the circulation by an intravenous drip; phleboclysis.
Fibrous hardening of the walls of the veins.
A radiogram of a vein after injection of a contrast medium.
1. The roentgenographic (x-ray) examination of veins.
2. A special x-ray of the veins that is performed by first injecting a radiopaque contrast that shows up on x-ray in the vein in question and then taking a conventional x-ray.

Used to demonstrate a blockage of a vein. Commonly used in the lower extremities to diagnose deep venous thrombosis.