e-cigarettee-cig‧a‧rette /ˈiː sɪɡəˌret $ ˌsɪɡəret/ noun [countable] 
a small piece of electronic equipment that is the same shape as a cigarette, and produces a mist containing nicotine that the user can breathe in
a small piece of electronic equipment that is the same shape as a cigarette, and produces a mist containing nicotine that the user can breathe in