1. 
   veins
   (Humans as organisms) thin-walled, valved tubes which carry blood back to the heart
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   veins
   The vessels carrying blood toward the heart. ... (12 Dec 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?veins
   
   
3. 
   Veins
   Vessels that carry blood from the body to the heart. (Read about 'Vascular System: Arteries and Veins')
   Found op http://www.stayinginshape.com/3osfcorp/libv/h15.shtml
   
   
4. 
   VEINS
   Large, thin-walled vessels that direct dexygenated blood from the tissues back to the heart.
   Found op http://www.thehorse.com/Glossary.xhtml?L=V
   
   
5. 
   veins
   Thin-walled vessels that carry blood to the heart. Units of the circulatory system that carry blood to the heart.
   Found op http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookglossv.html
   
   
6. 
   veins
   1) Blood carriers 2) Blood lines 3) Blood vessels 4) Carries blood to the heart 5) Lines on leaves 6) Places for ore 7) Streaks in marble 8) Valuable deposits 9) Vascular channels
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/veins/1
   
   

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