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reflux  vb 
1  (Chem) to boil or be boiled in a vessel attached to a condenser, so that the vapour condenses and flows back into the vessel  n 
2  (Chem) 
a an act of refluxing 
b (as modifier) 
a reflux condenser  
3 the act or an instance of flowing back; ebb 
 (C15: from Medieval Latin refluxus, from Latin refluere to flow back) 
reflux oesophagitis  n inflammation of the gullet caused by regurgitation of stomach acids, producing heartburn: may be associated with a hiatus hernia