The Collaborative International Dictionary of English v.0.48:

Descendant \De*scend"ant\, a. [F. descendant, p. pr. of
   descendre. Cf. Descendent.]
   Descendent.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Descendant \De*scend"ant\, n.
   One who descends, as offspring, however remotely; --
   correlative to ancestor or ascendant.
   [1913 Webster]

         Our first parents and their descendants. --Hale.
   [1913 Webster]

         The descendant of so many kings and emperors. --Burke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

descendant
    adj 1: going or coming down [syn: descendant, descendent]
    2: proceeding by descent from an ancestor; "descendent gene"
       [syn: descendant, descendent]
    n 1: a person considered as descended from some ancestor or race
         [syn: descendant, descendent] [ant: ancestor,
         antecedent, ascendant, ascendent, root]