Mendelian adjective 3noun 1forms 1 adjective3 •Of or relating to the Austrian biologist and friar Gregor Mendel (1822–1884) or his theories of genetics. •Following Gregor Mendel's laws of intergenerational gene transmission. •Of or relating to Gregor Mendel's laws of gene transmission.There are Mendelian inconsistencies in the data. noun1 •An adherent of the views of the Austrian biologist and friar Gregor Mendel (1822–1884). formsMendelians