Mammoth Uncensored Word List:
17 words that are 20 letters long beginning with m in the mammoth uncensored word list.

magnetofluiddynamics magnetohydrodynamics magnetostratigrapher magnetostratigraphic meningoencephalocele microcinematographic microcrystallinities microelectrophoreses microelectrophoresis microelectrophoretic microinterferometric microminiaturization micropaleontological micropaleontologists microphotometrically microstratifications mischaracterizations