1. (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;
WordNet (r) 3.0 (2006):
venipuncture
n 1: (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