| abomasum | (noun) the fourth compartment of the stomach of a ruminant; the one where digestion takes place | Synonyms: fourth stomach |
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| achromasia | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: lividity, lividness, luridness, paleness, pallidness, pallor, wanness |
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| admass | (noun) the segment of the public that is easily influenced by mass media (chiefly British) | - |
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| amastia | (noun) absence of the mammary glands (either through surgery or developmental defect) | - |
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| antinomasia | (noun) substitution of a title for a name | - |
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| bandmaster | (noun) the conductor of a band | - |
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| biomass | (noun) the total mass of living matter in a given unit area | - |
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| (noun) plant materials and animal waste used as fuel | - |
| bitumastic | (noun) a protective coating of asphalt and filter used on structural metals that are exposed to weathering | - |
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| burgomaster | (noun) a mayor of a municipality in Germany or Holland or Flanders or Austria | - |
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| camas | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camash, camass, camosh, quamash |
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| camash | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camass, camosh, quamash |
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| camass | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camosh, quamash |
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| choirmaster | (noun) the musical director of a choir | Synonyms: cantor, precentor |
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| damascene | (noun) a design produced by inlaying gold or silver into steel | - |
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| damask | (noun) a fabric of linen or cotton or silk or wool with a reversible pattern woven into it | - |
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| (noun) a table linen made from linen with a damask pattern | - |
| dichromasy | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromatism, dichromatopsia, dichromia |
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| dolmas | (noun) well-seasoned rice (with nuts or currants or minced lamb) simmered or braised in stock | Synonyms: stuffed grape leaves |
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| durmast | (noun) deciduous European oak valued for its tough elastic wood | Synonyms: Quercus petraea, Quercus sessiliflora |
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| emasculation | (noun) neutering a male animal by removing the testicles | Synonyms: castration |
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| (noun) loss of power and masculinity | - |
| foremast | (noun) the mast nearest the bow in vessels with two or more masts | - |
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| freemasonry | (noun) a natural or instinctive fellowship between people of similar interests | - |
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| gasmask | (noun) a protective mask with a filter; protects the face and lungs against poisonous gases | Synonyms: gas helmet, respirator |
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| grandmaster | (noun) a player of exceptional or world class skill in chess or bridge | - |
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| groundmass | (noun) (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded | - |
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| gynecomastia | (noun) excessive development of the breasts in males; usually the result of hormonal imbalance or treatment with certain drugs (including some antihypertensives) | - |
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| headmaster | (noun) presiding officer of a school | Synonyms: master, schoolmaster |
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| headmastership | (noun) the position of headmaster | - |
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| housemaster | (noun) teacher in charge of a school boardinghouse | - |
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| hypermastigote | (noun) flagellate symbiotic in the intestines of e.g. termites | - |
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| jiggermast | (noun) any small mast on a sailing vessel; especially the mizzenmast of a yawl | Synonyms: jigger |
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| lamasery | (noun) a monastery for lamas | - |
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| landmass | (noun) a large continuous extent of land | Synonyms: land mass |
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| lockmaster | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockkeeper, lockman |
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| mainmast | (noun) the chief mast of a sailing vessel with two or more masts | - |
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| mascara | (noun) makeup that is used to darken and thicken the eye lashes | - |
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| mascarpone | (noun) soft mild Italian cream cheese | - |
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| mascot | (noun) a character, animal or object that is adopted by a team or group as a symbolic figure | - |
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| masculine | (noun) a gender that refers chiefly (but not exclusively) to males or to objects classified as male | - |
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| masculinisation | (noun) the abnormal development of male sexual characteristics in a female (usually as the result of hormone therapies or adrenal malfunction) | Synonyms: masculinization, virilisation, virilization |
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| masculinity | (noun) the properties characteristic of the male sex | Synonyms: maleness |
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| (noun) the trait of behaving in ways considered typical for men | - |
| masculinization | (noun) the abnormal development of male sexual characteristics in a female (usually as the result of hormone therapies or adrenal malfunction) | Synonyms: masculinisation, virilisation, virilization |
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| masdevallia | (noun) any of numerous orchids of the genus Masdevallia; tufted evergreen often diminutive plants whose flowers in a remarkable range of colors usually resemble a tricorn with sepals fused at the base to form a tube | - |
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| maser | (noun) an acronym for microwave amplification by stimulated emission of radiation; an amplifier that works on the same principle as a laser and emits coherent microwave radiation | - |
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| mash | (noun) mixture of ground animal feeds | - |
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| (noun) a mixture of mashed malt grains and hot water; used in brewing | - |
| masher | (noun) a kitchen utensil used for mashing (e.g. potatoes) | - |
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| (noun) a man who is aggressive in making amorous advances to women | Synonyms: skirt chaser, wolf, woman chaser |
| mashie | (noun) middle-distance iron | Synonyms: five iron |
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| masjid | (noun) (Islam) a Muslim place of worship | Synonyms: musjid |
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| mask | (noun) activity that tries to conceal something | - |
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| (noun) a covering to disguise or conceal the face | - |
| (noun) a protective covering worn over the face | - |
| (noun) a party of guests wearing costumes and masks | Synonyms: masque, masquerade, masquerade party |
| masker | (noun) a participant in a masquerade | Synonyms: masquer, masquerader |
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| masking | (noun) the act of concealing the existence of something by obstructing the view of it | Synonyms: cover, covering, screening |
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| (noun) scenery used to block the audience's view of parts of the stage that should not be seen | Synonyms: masking piece |
| (noun) the blocking of one sensation resulting from the presence of another sensation | - |
| masochism | (noun) sexual pleasure obtained from receiving punishment (physical or psychological) | - |
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| masochist | (noun) someone who obtains pleasure from receiving punishment | - |
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| mason | (noun) a craftsman who works with stone or brick | Synonyms: stonemason |
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| masonry | (noun) the craft of a mason | - |
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| (noun) structure built of stone or brick by a mason | - |
| masque | (noun) a party of guests wearing costumes and masks | Synonyms: mask, masquerade, masquerade party |
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| masquer | (noun) a participant in a masquerade | Synonyms: masker, masquerader |
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| masquerade | (noun) making a false outward show | Synonyms: charade |
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| (noun) a costume worn as a disguise at a masquerade party | Synonyms: fancy dress, masquerade costume |
| (noun) a party of guests wearing costumes and masks | Synonyms: mask, masque, masquerade party |
| masquerader | (noun) a participant in a masquerade | Synonyms: masker, masquer |
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| mass | (noun) the property of a body that causes it to have weight in a gravitational field | - |
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| (noun) the property of something that is great in magnitude | Synonyms: bulk, volume |
| (noun) the common people generally | Synonyms: hoi polloi, masses, multitude, people, the great unwashed |
| (noun) an ill-structured collection of similar things (objects or people) | - |
| (noun) a body of matter without definite shape | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| massacre | (noun) the savage and excessive killing of many people | Synonyms: butchery, carnage, mass murder, slaughter |
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| massage | (noun) kneading and rubbing parts of the body to increase circulation and promote relaxation | - |
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| massager | (noun) someone who rubs or kneads parts of the body to stimulate circulation and promote relaxation | - |
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| massasauga | (noun) pygmy rattlesnake found in moist areas from the Great Lakes to Mexico; feeds on mice and small amphibians | Synonyms: massasauga rattler, Sistrurus catenatus |
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| (noun) small pygmy rattlesnake | Synonyms: ground rattler, Sistrurus miliaris |
| masse | (noun) a shot in billiards made by hitting the cue ball with the cue held nearly vertically; the cue ball spins around another ball before hitting the object ball | Synonyms: masse shot |
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| masses | (noun) the common people generally | Synonyms: hoi polloi, mass, multitude, people, the great unwashed |
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| masseter | (noun) a large muscle that raises the lower jaw and is used in chewing | - |
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| masseur | (noun) a male massager | - |
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| masseuse | (noun) a female massager | - |
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| massicot | (noun) the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment | Synonyms: massicotite |
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| massicotite | (noun) the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment | Synonyms: massicot |
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| massif | (noun) a block of the earth's crust bounded by faults and shifted to form peaks of a mountain range | - |
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| massiveness | (noun) an unwieldy largeness | Synonyms: bulkiness |
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| (noun) the property of being large in mass | Synonyms: heft, heftiness, ponderosity, ponderousness |
| mast | (noun) a vertical spar for supporting sails | - |
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| (noun) any sturdy upright pole | - |
| (noun) nuts of forest trees used as feed for swine | - |
| (noun) nuts of forest trees (as beechnuts and acorns) accumulated on the ground | - |
| mastaba | (noun) an ancient Egyptian mud-brick tomb with a rectangular base and sloping sides and flat roof | Synonyms: mastabah |
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| mastabah | (noun) an ancient Egyptian mud-brick tomb with a rectangular base and sloping sides and flat roof | Synonyms: mastaba |
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| mastalgia | (noun) pain in the breast | - |
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| mastectomy | (noun) surgical removal of a breast to remove a malignant tumor | - |
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| master | (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master copy, original |
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| (noun) key that secures entrance everywhere | Synonyms: master key, passe-partout, passkey |
| (noun) an artist of consummate skill | Synonyms: maestro |
| (noun) a combatant who is able to defeat rivals | Synonyms: superior, victor |
| (noun) an authority qualified to teach apprentices | Synonyms: professional |
| (noun) directs the work of others | - |
| (noun) a person who has general authority over others | Synonyms: lord, overlord |
| (noun) someone who holds a master's degree from academic institution | - |
| (noun) presiding officer of a school | Synonyms: headmaster, schoolmaster |
| (noun) an officer who is licensed to command a merchant ship | Synonyms: captain, sea captain, skipper |
| mastering | (noun) the act of making a master recording from which copies can be made | - |
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| (noun) becoming proficient in the use of something; having mastery of | - |
| mastermind | (noun) someone who creates new things | Synonyms: conceiver, originator |
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| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, brainiac, Einstein, genius |
| masterpiece | (noun) an outstanding achievement | - |
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| (noun) the most outstanding work of a creative artist or craftsman | Synonyms: chef-d'oeuvre |
| mastership | (noun) the position of master | - |
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| (noun) the skill of a master | - |
| masterstroke | (noun) an achievement demonstrating great skill or mastery | - |
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| masterwort | (noun) any plant of the genus Astrantia | Synonyms: astrantia |
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| mastery | (noun) the act of mastering or subordinating someone | Synonyms: subordination |
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| (noun) great skillfulness and knowledge of some subject or activity | Synonyms: command, control |
| (noun) power to dominate or defeat | Synonyms: domination, supremacy |
| masthead | (noun) the head or top of a mast | - |
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| (noun) the title of a newspaper or magazine; usually printed on the front page and on the editorial page | - |
| (noun) a listing printed in all issues of a newspaper or magazine (usually on the editorial page) that gives the name of the publication and the names of the editorial staff, etc. | Synonyms: flag |
| mastic | (noun) an evergreen shrub of the Mediterranean region that is cultivated for its resin | Synonyms: lentisk, mastic tree, Pistacia lentiscus |
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| (noun) an aromatic exudate from the mastic tree; used chiefly in varnishes | - |
| (noun) a pasty cement used as an adhesive or filler | - |
| mastication | (noun) biting and grinding food in your mouth so it becomes soft enough to swallow | Synonyms: chew, chewing, manduction |
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| mastiff | (noun) an old breed of powerful deep-chested smooth-coated dog used chiefly as a watchdog and guard dog | - |
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| mastigophoran | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophore |
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| mastigophore | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophoran |
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| mastitis | (noun) inflammation of a breast (or udder) | - |
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| mastocyte | (noun) a large connective tissue cell that contains histamine and heparin and serotonin which are released in allergic reactions or in response to injury or inflammation | Synonyms: labrocyte, mast cell |
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| mastodon | (noun) extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth | Synonyms: mastodont |
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| mastodont | (noun) extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth | Synonyms: mastodon |
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| mastoid | (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid bone, mastoid process, mastoidal |
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| mastoidal | (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid, mastoid bone, mastoid process |
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| mastoidale | (noun) the craniometric point at the lowest point of the mastoid process | - |
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| mastoidectomy | (noun) surgical removal of some or all of the mastoid process | - |
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| mastoiditis | (noun) inflammation of the mastoid | - |
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