12 letters · 19 points in Scrabble
noun (medicine) puncture of a vein through the skin in order to withdraw blood for analysis or to start an intravenous drip or to inject medication or a radiopaque dye
originFrom ven- + puncture, equivalent to veno- + puncture but with -i- as interconsonantal (versus -o-).
Etymology from Wiktionary, CC BY-SA 3.0