The Collaborative International Dictionary of English v.0.48:
M'edoc \M['e]`doc"\, n. [Cf. Mayduke.] A class of claret wines, including several varieties, from the district of M['e]doc in the department of Gironde. [1913 Webster]WordNet (r) 3.0 (2006):
Medoc n 1: red Bordeaux wine from the Medoc district of southwestern France