
1) Big name in california wine 2) French boy name 3) Surrealist Andre 
Found on 
https://www.crosswordclues.com/clue/masson
 [electoral district]
[electoral district]  Masson is a provincial electoral district in Quebec, Canada that elects members to the National Assembly of Quebec. It includes portions of the city of Mascouche and part of the city of Terrebonne (corresponding to the former city of La Plaine). It was created for the 1989 election from parts of the Terrebonne and L`Ass...
Found on 
http://en.wikipedia.org/wiki/Masson_(electoral_district)
 [publisher]
[publisher]  Masson was a French publisher specialised in medical and scientific collections. In 1987, Masson purchased Armand Colin. In turn, it became part of the City Group (Groupe de la Cité) in 1994. In 2005, Masson merged with Elsevier France, creating Elsevier Masson. == Notable publications == ...
Found on 
http://en.wikipedia.org/wiki/Masson_(publisher)

C.L. Pierre, Canadian pathologist, 1880-1959. ... See: Masson's pseudoangiosarcoma, Masson-Fontana ammoniacal silver stain. See entries under stain. ... (05 Mar 2000) ... 
Found on 
http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: mah-sawn[h]′ Definitions: 1. Pierre, Canadian pathologist, 1880-1959. See: Masson-Fontana ammoniac silver stain
Found on 
http://www.medilexicon.com/medicaldictionary.php?t=53034
  No exact match found.