| 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 | - |
| masticate | (verb) chew (food); to bite and grind with the teeth | Synonyms: chew, jaw, manducate |
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| (verb) grind and knead | - |
| 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 | (adjective) relating to or resembling a nipple | Synonyms: mastoidal |
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| (adjective) of or relating to or in the region of the mastoid process | - |
| (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid bone, mastoid process, mastoidal |
| mastoidal | (adjective) relating to or resembling a nipple | Synonyms: mastoid |
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| (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid, mastoid bone, mastoid process |
| 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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| masturbate | (verb) get sexual gratification through self-stimulation | Synonyms: fuck off, jack off, jerk off, she-bop, wank |
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| (verb) stimulate sexually | - |
| 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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| onomastic | (adjective) of or related to onomastics | - |
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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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| overmaster | (verb) overcome by superior force | Synonyms: overpower, overwhelm |
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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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| sadomasochistic | (adjective) of or relating to sadomasochism | - |
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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 |
| (adverb) with a loud crash | Synonyms: smashingly |
| (verb) break into pieces, as by striking or knocking over | Synonyms: dash |
| (verb) break suddenly into pieces, as from a violent blow | - |
| (verb) overthrow or destroy (something considered evil or harmful) | - |
| (verb) hit with great force | Synonyms: blast, boom, nail |
| (verb) collide or strike violently and suddenly | - |
| (verb) hit (a tennis ball) in a powerful overhead stroke | - |
| (verb) damage or destroy as if by violence | Synonyms: bang up, smash up |
| (verb) humiliate or depress completely | Synonyms: crush |
| (verb) hit violently | - |
| (verb) reduce to bankruptcy | Synonyms: bankrupt, break, ruin |
| smashed | (adjective) very drunk | Synonyms: besotted, blind drunk, blotto, cockeyed, crocked, fuddled, loaded, pie-eyed, pissed, pixilated, plastered, slopped, sloshed, soaked, soused, sozzled, squiffy, stiff, tight, wet |
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| 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 | (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, old, peachy, slap-up, swell |
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| (noun) the act of breaking something into small pieces | Synonyms: shattering |
| smashingly | (adverb) with a loud crash | Synonyms: smash |
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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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| unmask | (verb) reveal the true nature of | Synonyms: uncloak |
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| (verb) take the mask off | - |
| 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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