medium vein

me·di·um vein

a vein characterized by having a thinner wall and larger lumen than its corresponding artery, and a media with small bundles of circular muscle separated by considerable connective tissue; valves also occur.
References in periodicals archive ?
Resolute, having white seed, as do all four cultivars, has medium veins, as does US1140, while AC Polaris has weak veins and CDC Crocus has pronounced veins.
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