Source : Webster's Revised Unabridged Dictionary (1913)

Descender \De*scend"er\, n.
   One who descends.

Source : WordNet®

descender
     n 1: someone who descends
     2: a lowercase letter that has a part extending below other
        lowercase letters
     3: (printing) the part of lowercase letters that extends below
        the other lowercase letters

Source : Free On-Line Dictionary of Computing

descender
     
         A lowercase letter that extends below the base line,
        such as "g", "j", or "p".  Also used to denote the part of the
        letter extending below the base line.  Compare {ascender}.
     
        (1998-03-27)