| 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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| 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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