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1. Any of the veins that pass from the labia majora to the pudendal veins, such as the anterior labial and posterior labial veins.
2. Either of the two veins that drain the lips: inferior labial vein and superior labial.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.