| amastia | (noun) absence of the mammary glands (either through surgery or developmental defect) | - |
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| bandmaster | (noun) the conductor of a band | - |
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| 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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| choirmaster | (noun) the musical director of a choir | Synonyms: cantor, precentor |
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| durmast | (noun) deciduous European oak valued for its tough elastic wood | Synonyms: Quercus petraea, Quercus sessiliflora |
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| foremast | (noun) the mast nearest the bow in vessels with two or more masts | - |
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| grandmaster | (noun) a player of exceptional or world class skill in chess or bridge | - |
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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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| 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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| 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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| mastopathy | (noun) any pathology of the breast | Synonyms: mazopathy |
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| mastopexy | (noun) plastic surgery to lift or reshape the breasts | - |
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| masturbation | (noun) manual stimulation of the genital organs (of yourself or another) for sexual pleasure | Synonyms: onanism |
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| masturbator | (noun) a person who practices masturbation | Synonyms: onanist |
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| mizenmast | (noun) third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy | Synonyms: mizen, mizzen, mizzenmast |
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| mizzenmast | (noun) third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy | Synonyms: mizen, mizenmast, mizzen |
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| ommastrephes | (noun) extremely active cylindrical squid with short strong arms and large rhombic terminal fins | - |
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| onomasticon | (noun) a list of proper nouns naming persons or places | - |
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| onomastics | (noun) the branch of lexicology that studies the forms and origins of proper names | - |
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| paymaster | (noun) a person in charge of paying wages | - |
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| polymastigote | (noun) flagellates with several flagella | - |
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| postmaster | (noun) the person in charge of a post office | - |
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| quartermaster | (noun) an army officer who provides clothing and subsistence for troops | - |
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| quizmaster | (noun) the host or chairman of a radio or tv quiz show or panel game | Synonyms: question master |
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| ringmaster | (noun) the person in charge of performances in a circus ring | - |
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| schoolmaster | (noun) food fish of warm Caribbean and Atlantic waters | Synonyms: Lutjanus apodus |
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| (noun) presiding officer of a school | Synonyms: headmaster, master |
| (noun) any person (or institution) who acts as an educator | - |
| scoutmaster | (noun) the leader of a troop of Scouts | - |
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| spymaster | (noun) someone who directs clandestine intelligence activities | - |
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| stationmaster | (noun) the person in charge of a railway station | Synonyms: station agent |
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| sternocleidomastoid | (noun) one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head | Synonyms: musculus sternocleidomastoideus, sternocleido mastoideus, sternocleidomastoid muscle |
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| taskmaster | (noun) someone who imposes hard or continuous work | - |
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| toastmaster | (noun) the person who proposes toasts and introduces speakers at a banquet | Synonyms: symposiarch |
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| topmast | (noun) the mast next above a lower mast and topmost in a fore-and-aft rig | - |
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| trainmaster | (noun) a railroad employer who is in charge of a railway yard | Synonyms: train dispatcher, yardmaster |
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| webmaster | (noun) a technician who designs or maintains a website | - |
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| whoremaster | (noun) a pimp who procures whores | Synonyms: whoremonger |
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| (noun) a prostitute's customer | Synonyms: john, trick, whoremonger |
| yardmaster | (noun) a railroad employer who is in charge of a railway yard | Synonyms: train dispatcher, trainmaster |
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| zoomastigote | (noun) flagellate protozoan lacking photosynthesis and other plant-like characteristics | Synonyms: zooflagellate |
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