The Collaborative International Dictionary of English v.0.48:

Mendel \Mendel\ prop. n.
   Gregor Johann Mendel, founder of the science of genetics
   (1822-1884); Gregor Mendel.

   Syn: Gregor Mendel.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mendel
    n 1: Augustinian monk and botanist whose experiments in breeding
         garden peas led to his eventual recognition as founder of
         the science of genetics (1822-1884) [syn: Mendel, Gregor
         Mendel, Johann Mendel]