overcoat overcoat /ˈoʊvɝˌkoʊt/

noun

1. () A heavy coat worn over clothes in winter  ( topcoat , overcoat , greatcoat )
   a heavy coat worn over clothes in winter
     The soldier wore a warm greatcoat during the winter.
   The soldier wore a warm greatcoat during the winter.
   
   
2. An additional protective coating (as of paint or varnish)  ( overcoat , overcoating )
   an additional protective coating (as of paint or varnish)