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Wiktionary
radial artery

n. (context medicine human anatomy English) The main artery that enters the wrist on the side of the thumb.

WordNet
radial artery

n. branch of the brachial artery beginning below the elbow and extending down the forearm around the wrist and into the palm [syn: arteria radialis]

Wikipedia
Radial artery

In human anatomy, the radial artery is the main artery of the lateral aspect of the forearm.