| 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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| mishmash | (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, hotchpotch, melange, mingle-mangle, oddments, odds and ends, omnium-gatherum, ragbag |
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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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| monochromasy | (noun) complete color blindness; colors can be differentiated only on the basis of brightness | Synonyms: monochromacy, monochromatic vision, monochromatism, monochromia |
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| omasum | (noun) the third compartment of the stomach of a ruminant | Synonyms: psalterium, third stomach |
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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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| paronomasia | (noun) a humorous play on words | Synonyms: pun, punning, wordplay |
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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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| quamash | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camass, camosh |
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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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| sadomasochism | (noun) sadism and masochism combined in one person | - |
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| sadomasochist | (noun) someone who enjoys both sadism and masochism | - |
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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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| scramasax | (noun) A single-edged knife or sword used by the Anglo-Saxons for fighting and hunting. | Synonyms: scramaseax, scramsax |
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| scramaseax | (noun) A single-edged knife or sword used by the Anglo-Saxons for fighting and hunting. | Synonyms: scramasax, scramsax |
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| semasiology | (noun) the branch of semantics that studies the cognitive aspects of meaning | Synonyms: cognitive semantics, conceptual semantics |
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| smash | (noun) the act of colliding with something | Synonyms: crash |
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| (noun) a conspicuous success | Synonyms: bang, hit, smasher, strike |
| (noun) a hard return hitting the tennis ball above your head | Synonyms: overhead |
| (noun) a serious collision (especially of motor vehicles) | Synonyms: smash-up |
| (noun) a vigorous blow | Synonyms: bang, bash, belt, knock |
| smasher | (noun) a conspicuous success | Synonyms: bang, hit, smash, strike |
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| (noun) a very attractive or seductive looking woman | Synonyms: beauty, dish, knockout, looker, lulu, mantrap, peach, ravisher, stunner, sweetheart |
| (noun) a person who smashes something | - |
| smashing | (noun) the act of breaking something into small pieces | Synonyms: shattering |
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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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| stonemason | (noun) a craftsman who works with stone or brick | Synonyms: mason |
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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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| unmasking | (noun) the exposure of an impostor or a fraud | Synonyms: expose |
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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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| zymase | (noun) a complex of enzymes that cause glycolysis; originally found in yeast but also present in higher organisms | - |
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