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Marine engine (machine)
Marine engineering (naval architecture and marine engineering)
Marine machinery (naval architecture and marine engineering)
Marine microbiology (oceanography)
Marine mining (mining engineering)
Marine navigation (marine navigation)
Marine refrigeration (naval architecture and marine engineering)
Marine sediments (Geology)
Maritime meteorology (meteorology and climatology)
Marjoram (herb, plant)
Marl (type of soil)
Marmot (rodent)
Mars (4th planet from the sun)
Marsileales (polypodiophyta)
Marten (mammal)
Maser (mechanical device)
Masking of sound (acoustics)
Mass (in physics)
Mass defect (nuclear physics)
Mass number (in chemistry)
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Mass-luminosity relation (in astronomy)
Mastigophora (protozoa)
Mastitis (condition)
Matched-field processing (acoustics)
Materials handling (military)
Materials science and engineering (materials)
Materials-handling equipment (military)
Maternal behavior (physiological psychology)
Mathematical ecology (ecology)
Mathematical geography (physical geography, geomorphology)
Mathematical physics (Math)
Matter (in physics)
Matthiessen's rule (solid state physics)
Maxwell's demon (imaginary creature)
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