noun1. the flesh of sheep, esp of mature sheep, used as food
 2.  mutton dressed as lamb
3.  printing  another word for em (sense 1),   Compare nut (sense 12) 
 Word origin
C13 
moton sheep, from Old French, from Medieval Latin 
multō, of Celtic origin; the term was adopted in printing to distinguish the pronunciationof 
em quad from 
en quad