1. 
   Valveless
   The Valveless was an English automobile manufactured from 1908 until 1915 in Huddersfield, Yorkshire. The successor to the Ralph Lucas Valveless, the car marked the entry of the David Brown group into the manufacture of motors. Its engine was a 25 hp duplex two-stroke model which was advertised as ...
   Found op http://en.wikipedia.org/wiki/Valveless
   
   
2. 
   valveless
   Without valves; denoting certain veins, such as the portal, that are not provided with valves as are most of the veins. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?valveless
   
   
3. 
   valveless
   Type: Term Pronunciation: valv′les Definitions: 1. Without valves; denoting certain veins (portal) that are not provided with valves as most veins are.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=96747
   
   

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