- mamillopeduncular tract
 - malraux
 - modulated waveform
 - modulation percentage
 - modulation index
 - mylabris pustulata
 - macro_
 - macroblepharia
 - macroclimate
 - macrodystrophia
 - macleods syndrome
 - macroassembly program
 - macrosmic
 - macroglobin
 - microgeographic variation
 - macrotrace
 - macrogenitosomia precox
 - macrostatement number
 - macula utriculi
 - macula sacculi
 - madar
 - mary shelley
 - magenesium ammonium phosphate
 - magenesium oleate
 - magill forceps
 - magnetic ink scanner
 - malting point
 - merida
 - mauritius
 - markoff
 - marking_end distortion
 - mongolia
 - m.m.
 - magnetic card
 - magnetic encoding
 - met on
 - morley
 - machine equation
 - multidirectional microphone
 - machine intelligence
 - multicentricity
 - magnetic ink character sorter
 - multiplier
 - melchior
 - mantineia
 - malthus
 - Mantis religioso
 - meinicke reaction
 - myeloid
 - myelinogenesis