| m ... M67 |
| M72 ... maarib |
| Maas, Peter ... macaronic poetry |
| macaroon ... Macdonald, Flora |
| Macdonald, Frances ... Macerata |
| maceration ... machine language |
| machine learning ... Mackensen, Fritz |
| Mackenzie Delta ... Maclear's Beacon |
| MacLeary, Donald ... MacPherson, Stewart Myles |
| Macquarie Bank Ltd. ... Macrozamia hopei |
| MacStiofain, Sean ... Madeira Island |
| Madeira Islands ... Madison, Helene |
| Madison, James ... Madurai |
| Madurese ... Maga, Hubert |
| Magadan ... Magha |
| Magha ... Magne, Tour |
| Magnel, Gustave ... magnetic monopole |
| magnetic observatory ... magnetoresistance |
| magnetosheath ... Magnusson, Jon |
| Magnusson, Magnus ... Mahaicony River |
| mahajan ... mahavrata |
| mahavratin ... Mahjub, Muhammad Ahmad |
| Mahlarayim ... Maia |
| Maia ... main gasing |
| main geomagnetic field ... Maiorescu, Titu |
| Maipo Volcano ... Majdanek |
| Majdanpek ... majority floor leader |
| majority system ... Makiritare |
| Makiyivka ... Malacca, Strait of |
| Malacca, sultanate of ... Malatesta, Errico |
| Malatesta, Gianciotto ... Malden, Karl |
| Maldeo, Rao ... Malibamatso River |
| Malibran, Maria ... Mallarme, Francois-Rene-Auguste |
| Mallarme, Stephane ... malong |
| malonic acid ... malting |
| Malton ... Mamertinus, Claudius |
| Mamertus of Vienne, Saint ... Mana Pools National Park |
| Manacus ... Mance, Sir Henry Christopher |
| Manche ... Mandan |
| Mandan ... mandolin |
| Mandor ... manganese oxide |
| manganese processing ... Manhattan Bridge |
| Manhattan Building ... Manipur Hills |
| Manipur River ... Mann, Tom |
| Mann-Whitney-Wilcoxon test ... Manolete |
| Manolov, Emanuil ... mansubat |
| Mansur ... Mantyranta, Eero |
| Manu ... many-worlds interpretation |
| Manyakheta ... Mapfumo, Thomas |
| Mapimi Basin ... marabout |
| maraca ... Marathon Oil Corporation |
| Marathon orogeny ... marcasite |
| Marceau, Francois-Severin ... Marche, Jacques de Bourbon, Count de la |
| Marche-Vedome, La ... Mardi Gras |
| Mardin ... Margam Abbey |
| Margaret ... marginal propensity to consume |
| marginal propensity to save ... Marian antiphon |
| Mariana ... Marienkirche |
| Mariental ... Marine Ordinances |
| marine otter ... Marionetteatern |
| Mariotte, Edme ... Mark The Hermit |
| Mark, Edward ... Markham, William |
| markhor ... Marmolada, Mount |
| Marmon 16 ... Marquesan culture |
| Marquesas Islands ... Mars, Forrest Edward |
| Mars-la-Tour and Gravelotte, Battles of ... marshaling yard |
| Marshall ... Marsyas Painter |
| MARTa Museum ... Martin of Tours, Saint |
| Martin of Troppau ... Martin-Santos, Luis |
| Martina Franca ... Martyn, John |
| Martyn, Thomas J. C. ... Mary Gregory glass |
| Mary I ... Mas'ud Sa'd Salman |
| Mas'udi, al- ... mash tun |
| mashal ... Masolino |
| Mason and Dixon Line ... mass burn system |
| mass defect ... Massawa |
| Massena ... master builder |
| master clock ... Masyumi |
| Mat ... matchmaking |
| mate ... mathematics, philosophy of |
| mathematics, South Asian ... Mato Grosso do Sul |
| Mato Grosso Plateau ... Matsumura Gekkei |
| Matsunaga family ... Matthew, Gospel According to |
| Matthew, Saint ... matzo |
| Mau ... Maupassant, Guy de |
| Maupeou, Rene-Nicolas-Charles-Augustin de ... Mausolus |
| Mauss, Marcel ... Maxillopoda |
| maxillulae ... Maxwell's equations |
| Maxwell's Hill ... Mayan hieroglyphic writing |
| Mayan Languages, Academy of ... Mayne, Thom |
| Maynooth ... Mayweather, Floyd |
| Mayweather, Roger ... Mazzini, Giuseppe |
| Mazzucco, Melania G. ... McBrayer, Staley Thomas |
| McBride, Mary Margaret ... McCook |
| McCool, William C. ... McDaniel, Hattie |
| McDermitt Mine ... McGinn, Colin |
| McGivney, Michael J. ... McKay, Heather |
| McKay, Jim ... McLean, Donald |
| McLean, Edward B. ... McPartland, Jimmy |
| McPartland, Marian ... Meade, George G |
| Meade, James Edward ... Meares, Anna |
| Meares, John ... mechanical picture |
| mechanical powdering ... medallion carpet |
| Medan ... medical care foundation |
| medical chemistry ... medicine |
| Medicine Bow Mountains ... medium of exchange |
| medium-bypass turbofan ... meeting of minds |
| meetinghouse ... Megasthenes |
| megastrobilus ... Mehring, Franz |
| Mehsana ... meiospore |
| meiotic nondisjunction ... Melaka |
| Melambe River ... Melchior, Johann Peter |
| Melchiorite ... Mellaart, James |
| Mellan, Claude ... Melrose Abbey |
| melt ... Memoire d'Encrier |
| Memorandum of Understanding ... Menard, John Willis |
| Menard, Louis-Nicolas ... Mendota, Lake |
| Mendoza ... Menilek II |
| Menilmontant ... Menotti, Gian Carlo |
| Menou, 'Abd Allah Jacques ... Mephistopheles |
| Meppel ... Mercer, Lucy |
| mercerization ... Mercury |
| mercury barometer ... Meri, Veijo |
| Meriam, Junius L. ... Merlin, Antoine-Christophe |
| Merlin, Joseph ... Merrill, Frank Dow |
| Merrill, James ... Meru, Mount |
| Meru, Mount ... mesite |
| Mesitornis ... mesosphere |
| mesosternum ... Messina |
| Messina earthquake and tsunami ... Metacrinus |
| metaethics ... metalogic |
| metalogical variable ... metathesis |
| metathesis reaction ... Meteren, Emanuel van |
| metes and bounds ... methyl ether |
| methyl ethyl ketone ... metric ton |
| metrical doxology ... metziltayim |
| Meudon ... Mexican vanilla |
| Mexican west coast rattlesnake ... Meyerhold, Vsevolod Yemilyevich |
| Meyers Enzyklopadisches Lexikon ... MI6 |
| Miacis ... Michael Borisovich |
| Michael Cerularius ... Michels, Rinus |
| Michels, Robert ... Microbembex monodonta |
| microbenthos ... microfauna |
| microfibril ... microscopic symptom |
| microseism ... Mid Suffolk |
| Mid Sussex ... Middle Eastern music |
| Middle Eastern religion ... Middlesex |
| Middlesex ... Midobi language |
| Midogo ... MiG-21 |
| MiG-23 ... Mikhailau, Anatol |
| Mikhalkov, Nikita ... Milbank |
| Milbanke, Anne Isabella ... Milingo, Emmanuel |
| Milinkevich, Alyaksandr ... Milk River |
| milk sickness ... Millennium Dome |
| Millennium Ecosystem Assessment ... Miller, Sanderson |
| Miller, Seton I. ... Mills, Donald Friedlich |
| Mills, Florence ... Milton, (Clement) Arthur |
| Milton, John ... Min Mountains |
| Min River ... Minch, The |
| Minchancaman ... mineral synthesis |
| mineral tanning ... minhwa |
| Mini ... Ministers of the European Union, Council of |
| Ministers of the Sick ... Mino pottery |
| Minoan civilization ... Minto, Gilbert John Elliot-Murray-Kynynmound, 4th earl of |
| Mintoff, Dom ... Mirabeau, Andre-Boniface-Louis Riqueti, vicomte de |
| Mirabeau, Honore-Gabriel Riqueti, comte de ... Mirisch, Walter |
| Mirish languages ... Misenum |
| Misenum, Treaty of ... missing link |
| mission ... Missoula, Lake |
| Missouri ... Mitchell, Edgar D. |
| Mitchell, Elisha ... Mitiaro |
| miticide ... Mitsui Group |
| Mitsui Mining and Smelting Company, Ltd. ... mixed triglyceride |
| mixed uranium-plutonium dioxide pellet ... Mizrahi |
| Mizrahi, Moshe ... moai figure |
| moai kavakava ... Mocenigo, Andrea |
| Mocenigo, Giovanni ... Model T |
| model theory ... Modernismo |
| Modernismo ... modus operandi |
| modus ponens and modus tollens ... Mohammad 'Azam Khan |
| Mohammad ebn Mosafer ... Moiseiwitsch, Tanya |
| Moiseyev, Igor ... mold |
| Mold ... molecular orbital |
| molecular orbital energy-level diagram ... Molly Maguires |
| Molnar, Ferenc ... mon |
| Mon kingdom ... Moncalieri |
| Moncalieri, Proclamation of ... Money, John |
| money-market mutual fund ... Monk's Tale stanza |
| Monk, Maria ... monochrome |
| Monocirrhus polyacanthus ... Monongahela, Battle of the |
| Mononobe family ... Monreale, Monastery of |
| Monro family ... Monstera |
| monstrance ... Montana, flag of |
| Montana, Joe ... Montefiore, Sir Moses, Baronet |
| Montego Bay ... Montezuma II |
| Montfaucon, Bernard de ... Monticello |
| Monticello Dam ... Montserrat Company |
| Montt, Manuel ... moon-toothed degu |
| Mooney, James ... Moore, Michael |
| Moore, Mike ... Morais, Sabato |
| Morais, Vinicius de ... moray |
| Moray ... Morelos |
| Morelos, Jose Maria ... Morgan, George |
| Morgan, Helen ... Moricz, Zsigmond |
| Morier, James Justinian ... Mornay, Duke de |
| Mornay, Philippe de, seigneur du Plessis-Marly ... Morozov, Pavlik |
| Morpeth ... Morris, Clara |
| Morris, Craig ... Morro Velho Mine |
| Morrow, Barry ... Morton, Joe |
| Morton, John ... Mosconi, Willie |
| Moscoso, Luis de ... Mosher, Eliza Maria |
| Mosher, Thomas ... Mostar Bridge |
| mostarda di frutta ... motif |
| Motihari ... motor neuron |
| motor sailer ... Moulins |
| Moulins faience ... Mount Rainier National Park |
| Mount Revelstoke National Park ... mountain zebra |
| Mountain Zebra National Park ... Mouton, Gabriel |
| Mouton, Jean ... Mowat, Oliver |
| Mowatt, Anna Cora ... MP38 submachine gun |
| MP40 submachine gun ... Mu Scorpii |
| mu tree ... mucocutaneous leishmaniasis |
| mucocyst ... Mueller, Lisel |
| Mueller, Robert ... Muhammad al-Mahdi al-Hujjah |
| Muhammad al-Munsif ... Muhammad, 'Ali Nasir |
| Muhammad, Elijah ... mujtahid |
| Mujur rug ... Muldoon, Paul |
| Muldoon, Robert ... Muller, Paul Hermann |
| Muller, Sophus Otto ... multigrade |
| multigraph ... multiple souls |
| multiple-arch dam ... Mumbles, the |
| Mumford, David Bryant ... Mungiu, Cristian |
| Mungo ... Munster |
| Munster ... Murad III |
| Murad IV ... Murdoch, Rupert |
| Murdoch, Walter ... Murphy, Shaun |
| Murphy, William P. ... Murren |
| Murrow, Edward R ... Musar |
| Musarurwa, Willie ... Musei, Palazzo dei |
| musellem ... music hall and variety |
| music industry ... Muskegon |
| muskellunge ... must |
| Musta'in, Ahmad II al- ... Mutawwa'un |
| mute ... Muzaffar ad-Din Gokburi |
| Muzaffar ad-Din Sonqur ... Mycobacterium bovis |
| Mycobacterium kansasii ... Mylodon |
| mylonite ... Myrciaria jaboticaba |
| Myrdal, Alva Reimer ... Mystacinidae |
| mysterian ... |
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