"Brick mould" (US rather than UK terminology) is actually used to hide the "cochonnet". The visible part of the cochonnet is the outer face of the subframe.

However, "cochonnet" is also used for the stop bead that extends beyond the subframe in order to support and provide a neat edge to the render. This is the definition given in Dicobat, which calls it a "bead stop" [sic] rather than "stop bead".

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Note added at 18 hrs (2013-05-12 09:37:44 GMT)
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Just a note on construction methods. Window subframes are increasingly used in the UK for fitting pre-fabricated windows. These subframes are simply fitted into the openings and do not have a structural role other than supporting the window frames. In France, replacement windows are generally fitted into existing subframes, but in the UK the original window is generally completely removed and the replacement window fitted directly to the brickwork. The French method leaves potential problems with old timber subframes vulnerable to rot (sometimes already rotten) left around your expensive new windows. I believe that the reason for this is that French houses are constructed with window subframes having a structural role that they don't have in the UK and that they are integrated into the walls, so cannot easily be removed.