1. [n]  an incorrect deal
2. [v]  deal cards wrongly

MISDEAL is a 7 letter word that starts with M.

1. \Mis*deal"\, v. t. & i. [imp. & p. p. {Misdealt}; p. pr.
   & vb. n. {Misdealing}.]
   To deal or distribute wrongly, as cards; to make a wrong
   distribution.
   
   

2. \Mis*deal"\, n.
   The act of misdealing; a wrong distribution of cards to the
   players.