vasa vasorum

Medical Dictionary

vasa vasorum vasa va·so·rum (vā-sôr'əm, -zôr'-)
pl.n.
Small arteries that are distributed to the outer and middle coats of the larger blood vessels and to their corresponding veins.

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WordNet
vasa vasorum

noun
any small blood vessel ramifying on the outside of a major artery or vein 
WordNet® 3.0, © 2006 by Princeton University.
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