
• (a.) Of or pertaining to Auer von Welsbach or the incandescent gas burner invented by him.
Found on 
http://thinkexist.com/dictionary/meaning/welsbach/
 Wels'bach  adjective
Wels'bach  adjective  Of or pertaining to Auer von 
 Welsbach or the incandescent gas burner invented by him. --  
 Welsbach burner , 
 a burner in which the combustion of a mixture of air and gas or vapor is employed to heat to incandescence a mantle composed of thoria and ceria. The mantle i...
Found on http://www.encyclo.co.uk/webster/W/24
  No exact match found.