grem‧lin /ˈɡremlən, ˈɡremlɪn/ 
 noun [countable][
Date: 1900-2000; 
Origin: Perhaps from Irish Gaelic gruaimin 'angry little man'; influenced by goblin]
 an imaginary evil spirit that is blamed for problems in machinery 
 [TahlilGaran] Dictionary of Contemporary English ▲