mull1
  
  v.
 
(
usu. mull over)
 think about at length.
 
  Etymology
  C19: of uncertain origin.
 
  
    
mull2
  
  v.
 
[
usu. as adj. mulled]
 warm (wine or beer) and add sugar and spices to it.
 
  Etymology
  C17: of unknown origin.
 
  
    
mull3
  
  n.
 (in Scottish place names) a promontory:
 the Mull of Kintyre.
 
  Etymology
  ME: cf. Sc. Gaelic maol and Icelandic múli.
 
  
    
mull4
  
  n.
 humus formed under non-acid conditions.
 
  Etymology
  1920s: from Dan. muld ‘soil’.
 
  
    
mull5
  
  n.
 a thin muslin, used in bookbinding for joining the spine of a book to its cover.
 
  Etymology
  C17: abbrev., from Hindi malmal.