[1] : The Collaborative International Dictionary of English v.0.48

marten \mar"ten\, n. from older martern, marter, martre, f.
   martre, marte, ll. martures pl., fr. l. martes; akin to as.
   meareth, meard, g. marder, ohg. mardar, icel. m"orethr.
   cf. foumart.
   1. zool. any one of several fur-bearing carnivores of the
      genus martes formerly mustela, closely allied to the
      sable. among the more important species are the european
      beech marten or stone marten martes foina; the
      pine marten martes martes; and the american
      marten, or sable martes americana, which some
      zoologists consider only a variety of the russian sable.
      1913 webster +pjc

   2. the fur of the marten, used for hats, muffs, etc.
      1913 webster
see also:
foumart martes mustela beech marten stone marten martes foina 
pine marten martes martes american marten sable martes americana 

[2] : WordNet (r) 2.0

martes foina
     n : eurasian marten having a brown coat with pale breast and
         throat syn: stone marten, beech marten
see also:
stone marten beech marten 

Martes >> M Words
Martes, definition of term: Martes
martes_pag1.html