Source : Webster's Revised Unabridged Dictionary (1913)

Prepollent \Pre*pol"lent\, a. [L. praepollens, p. p. of
   praepollere to surpass in power; prae before + pollere to be
   powerful.]
   Having superior influence or power; prevailing; predominant.
   [R.] --Boyle.

Prepollent \Pre*pol"lent\, n.; pl. {Prepollices}. [NL. See
   {Pre-}, {Pollex}.] (Anat.)
   An extra first digit, or rudiment of a digit, on the preaxial
   side of the pollex.