The Collaborative International Dictionary of English v.0.48:

Mashie \Mash"ie\, Mashy \Mash"y\, n.; pl. Mashies. [Etym.
   uncert.]
   A golf club like the iron, but with a shorter head, slightly
   more lofted, used chiefly for short approaches.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

mashie
    n 1: middle-distance iron [syn: mashie, five iron]