From Longman Dictionary of Contemporary Englishmiddle fingerˌmiddle ˈfinger noun [countable] HBHthe longest finger on your hand
Examples from the Corpus
middle finger• When the Reclusiarch passed back again, each initiate must hold out his middle finger, pointing stiffly forward from his fist.• I was squealing with delight at the tricks his middle finger was playing when suddenly Captain leapt on us growling.• Pausing at the door he turned once more and extended the middle finger of his right hand towards the bed.• The middle finger traced a heart on her lips. 