The Collaborative International Dictionary of English v.0.48:

Marten \Mar"ten\ (m[aum]r"t[e^]n), n. (Zool.)
   A bird. See Martin.
   [1913 Webster]

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.
   mear[eth], meard, G. marder, OHG. mardar, Icel. m["o]r[eth]r.
   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]

The Collaborative International Dictionary of English v.0.48:

Martin \Mar"tin\, n. [F. martin, from the proper name Martin.
   Cf. Martlet.] (Zool.)
   One of several species of swallows, usually having the tail
   less deeply forked than the tail of the common swallows.
   [Written also marten.]
   [1913 Webster]

   Note: The American purple martin, or bee martin (Progne
         subis or Progne purpurea), and the European house
         martin, or window martin (Hirundo urbica or
         Chelidon urbica), are the best known species.
         [1913 Webster]

   Bank martin.
   (a) The bank swallow. See under Bank.
   (b) The fairy martin. See under Fairy.

   Bee martin.
   (a) The purple martin.
   (b) The kingbird.

   Sand martin, the bank swallow.
      [1913 Webster]

WordNet (r) 3.0 (2006):

marten
    n 1: agile slender-bodied arboreal mustelids somewhat larger
         than weasels [syn: marten, marten cat]