The Collaborative International Dictionary of English v.0.48:

Pekan \Pek"an\, n. [F. pekan.] (Zool.)
   See Fisher, 2.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pekan
    n 1: large dark brown North American arboreal carnivorous mammal
         [syn: fisher, pekan, fisher cat, black cat, Martes
         pennanti]