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]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "descendant":
   aftermath, backup man, breed, brood, by-product, child, children,
   conclusion, consequence, daughter, derivative, descendants,
   descent, dynasty, effect, family, foster child, fruit, grandchild,
   grandchildren, granddaughter, grandson, great-grandchildren, heir,
   heiress, heirs, hostages to fortune, inheritor, inheritors, issue,
   kids, line, lineage, little ones, new generation, offshoot,
   offspring, posterity, progeniture, progeny, replacement,
   rising generation, scion, seed, sequel, son, son and heir, sonny,
   sons, spin-off, stepchild, stepdaughter, stepson, succession,
   successor, treasures, younglings, youngsters