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mass, weight

mass: the amount of matter that an object contains

weight: how strongly the mass is pulled by gravity (e.g. an astronaut is weightless in space but has the same mass as on Earth)

may

See can, may, might

may be, maybe

may be (verb): could possibly be

The result may be surprising.

maybe (adverb): perhaps

Maybe the results will surprise you.
maybe

See may be, maybe

mean

See average, mean, median, mode

median

See average, mean, median, mode

medication

See drug, medication, medicine

medicine

See drug, medication, medicine

meteor

See asteroid, meteor, meteorite, meteoroid

meteorite

See asteroid, meteor, meteorite, meteoroid

meteoroid

See asteroid, meteor, meteorite, meteoroid

method, methodology

method: a process or technique

methodology: the general strategy of how a research project will be done, including identification of the methods to be used

methodology

See method, methodology

microbe

See bug, germ, microbe, microorganism

microorganism

See bug, germ, microbe, microorganism

might

See can, may, might

mode

See average, mean, median, mode

molecular mass, molecular weight

molecular weight (MW): the ratio of the mass of a molecule to the standardised mass of an atom (note that MW does not take a unit because it is a ratio)

molecular mass: the mass of a substance divided by the amount of substance; usually expressed in daltons (Da) where 1 Da = 1 gram/mole

molecular weight

See molecular mass, molecular weight

morphology

See anatomy, morphology

mutant, mutation

mutant: an organism carrying one or more mutations

mutation: an alteration in the primary sequence of the genetic material that can be mapped to a specific place (locus) on the DNA

mutation

See mutant, mutation