mĕd-eri, to heal; medic-us, physician: medical, re-medy.
medi-us, middle: medium, mediocre, mediator, mean and means (Fr.).
mĕmor, mindful; mĕmŏro (mĕmŏrāt-), I recount: memory, memorandum.
mens (mĕnt-), mind; re-min-isci, I remember: mental, reminiscent, comment.
mĕre-o (mĕrit-), I deserve: merit, meritorious.
merx (merc-), wares; mercor (mercāt-), I purchase; merces (mercēd-), hire: merchant, mercantile, market = mart, mercenary.
mēt-iri (mens-), to measure: mensuration, dimension, measure (Fr.).
miles (mīlĭt-), soldier: military, militant, militia.
mille, thousand: mile, millesimal, million and millimetre (Fr.), etc.