1. 
   Filtrum
   the dimple or indentation under the nose directly above the upper lip.
   Found op http://www.cosmeticdentistryguide.co.uk/glossary.html
   
   
2. 
   filtrum
   <dentistry> The dimple or indentation under the nose directly above the upper lip. ... (08 Jan 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?filtrum
   
   
3. 
   filtrum
   Type: Term Pronunciation: fil′trŭm Synonyms: filter1
   Found op http://www.medilexicon.com/medicaldictionary.php?t=33381
   
   
4. 
   Filtrum
   the dimple or indentation under the nose directly above the upper lip.
   Found op http://www.bracesinfo.com/glossary.html
   
   

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