| matrimonial | (adjective) of or relating to the state of marriage | Synonyms: marital, married |
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| maturational | (adjective) relating to or involved in maturation | - |
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| matutinal | (adjective) pertaining to or occurring in the morning | - |
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| maxillodental | (adjective) of or relating to the upper jaw and its associated teeth | - |
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| maxillofacial | (adjective) of or relating to the upper jaw and face (particularly with reference to specialized surgery of the maxilla) | - |
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| maximal | (adjective) the greatest or most complete or best possible | Synonyms: maximum |
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| mayoral | (adjective) of or relating to a mayor or the office of mayor | - |
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| mechanical | (adjective) using (or as if using) mechanisms or tools or devices | - |
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| (adjective) relating to or governed by or in accordance with mechanics | - |
| (adjective) relating to or concerned with machinery or tools | Synonyms: mechanically skillful, technical |
| mediaeval | (adjective) relating to or belonging to the Middle Ages | Synonyms: medieval |
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| (adjective) as if belonging to the Middle Ages; old-fashioned and unenlightened | Synonyms: gothic, medieval |
| (adjective) characteristic of the time of chivalry and knighthood in the Middle Ages | Synonyms: chivalric, knightly, medieval |
| medial | (adjective) relating to or situated in or extending toward the middle | Synonyms: median |
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| (adjective) dividing an animal into right and left halves | Synonyms: median |
| mediatorial | (adjective) of or relating to a mediator or the duties of a mediator | - |
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| medical | (adjective) requiring or amenable to treatment by medicine especially as opposed to surgery | - |
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| (adjective) relating to the study or practice of medicine | - |
| (adjective) of or belonging to Aesculapius or the healing art | Synonyms: aesculapian |
| medicinal | (adjective) having the properties of medicine | Synonyms: medicative |
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| medicolegal | (adjective) pertaining to legal aspects of the practice of medicine (as malpractice or patient consent for operations or patient information) | - |
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| medieval | (adjective) relating to or belonging to the Middle Ages | Synonyms: mediaeval |
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| (adjective) as if belonging to the Middle Ages; old-fashioned and unenlightened | Synonyms: gothic, mediaeval |
| (adjective) characteristic of the time of chivalry and knighthood in the Middle Ages | Synonyms: chivalric, knightly, mediaeval |
| megalomaniacal | (adjective) suffering from megalomania | Synonyms: megalomanic |
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| menial | (adjective) used of unskilled work (especially domestic work) | Synonyms: humble, lowly |
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| meningeal | (adjective) relating to the meninges | - |
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| menopausal | (adjective) of or relating to the menopause | - |
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| mensal | (adjective) pertaining to or used at the dining table | - |
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| menstrual | (adjective) of or relating to menstruation or the menses | Synonyms: catamenial |
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| mensural | (adjective) having notes of fixed rhythmic value | Synonyms: measured, mensurable |
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| (adjective) of or relating to measure | - |
| mental | (adjective) involving the mind or an intellectual process | - |
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| (adjective) of or relating to the mind | - |
| (adjective) of or relating to the chin- or liplike structure in insects and certain mollusks | - |
| (adjective) of or relating to the chin or median part of the lower jaw | Synonyms: genial |
| (adjective) affected by a disorder of the mind | - |
| mercurial | (adjective) relating to or containing or caused by mercury | - |
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| (adjective) liable to sudden unpredictable change | Synonyms: erratic, fickle, quicksilver |
| meridional | (adjective) of or relating to a meridian | - |
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| (adjective) located in the south or characteristic of southern people or places | - |
| mesial | (adjective) being in or directed toward the midline or mesial plane of the body | - |
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| mesodermal | (adjective) relating to or derived from the mesoderm | Synonyms: mesoblastic |
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| metacarpal | (adjective) of or relating to the metacarpus | - |
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| metal | (adjective) containing or made of or resembling or characteristic of a metal | Synonyms: metallic |
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| metallurgical | (adjective) of or relating to metallurgy | Synonyms: metallurgic |
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| metaphorical | (adjective) expressing one thing in terms normally denoting another | Synonyms: metaphoric |
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| metaphysical | (adjective) pertaining to or of the nature of metaphysics | - |
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| (adjective) transcending physical matter or the laws of nature | - |
| (adjective) highly abstract and overly theoretical | - |
| metatarsal | (adjective) of or relating to the metatarsus | - |
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| meteoritical | (adjective) of or relating to or caused by meteorites | Synonyms: meteoritic |
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| meteorological | (adjective) of or pertaining to atmospheric phenomena, especially weather and weather conditions | Synonyms: meteoric, meteorologic |
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| methodical | (adjective) characterized by method and orderliness | - |
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| methodological | (adjective) relating to the methodology of some discipline | - |
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| metonymical | (adjective) using the name of one thing for that of another with which it is closely associated | Synonyms: metonymic |
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| metrical | (adjective) based on the meter as a standard of measurement | Synonyms: metric |
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| (adjective) the rhythmic arrangement of syllables | Synonyms: measured, metric |
| metrological | (adjective) of or relating to metrology | - |
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| metrosexual | (adjective) a heterosexual man that is particularly interested in his appearance, being well-groomed and fashion | - |
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| miasmal | (adjective) filled with vapor | Synonyms: miasmic, vaporous, vapourous |
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| microbial | (adjective) of or involving or caused by or being microbes | Synonyms: microbic |
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| microscopical | (adjective) of or relating to or used in microscopy | Synonyms: microscopic |
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| (adjective) so small as to be invisible without a microscope | Synonyms: microscopic |
| (adjective) visible under a microscope; using a microscope | Synonyms: microscopic |
| microsomal | (adjective) of or relating to microsomes | - |
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| migrational | (adjective) of or related to migration | - |
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| millennial | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennian |
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| mineral | (adjective) relating to minerals | - |
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| (adjective) composed of matter other than plant or animal | - |
| minimal | (adjective) the least possible | Synonyms: minimum |
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| ministerial | (adjective) of or relating to a government minister or ministry | - |
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| (adjective) of or relating to a minister of religion or the minister's office | - |
| misanthropical | (adjective) believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others | Synonyms: cynical, misanthropic |
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| (adjective) hating mankind in general | Synonyms: misanthropic |
| missional | (adjective) relating to or connected to a religious mission | Synonyms: missionary |
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| mitral | (adjective) of or relating to or located in or near the mitral valve | - |
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| (adjective) relating to or resembling the miter worn by some clerics | - |
| mnemotechnical | (adjective) of or relating to or involved the practice of aiding the memory | Synonyms: mnemonic, mnemotechnic |
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| modal | (adjective) relating to or expressing the mood of a verb | - |
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| (adjective) of or relating to a musical mode; especially written in an ecclesiastical mode | - |
| (adjective) relating to or constituting the most frequent value in a distribution | Synonyms: average |
| molal | (adjective) designating a solution containing one mole of solute per kilogram of solvent | - |
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| monarchal | (adjective) having the characteristics of or befitting or worthy of a monarch | Synonyms: monarchical |
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| (adjective) ruled by or having the supreme power resting with a monarch | Synonyms: monarchic, monarchical |
| monarchical | (adjective) having the characteristics of or befitting or worthy of a monarch | Synonyms: monarchal |
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| (adjective) ruled by or having the supreme power resting with a monarch | Synonyms: monarchal, monarchic |
| monastical | (adjective) of communal life sequestered from the world under religious vows | Synonyms: cloistered, cloistral, conventual, monastic |
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| monaural | (adjective) relating to or having or hearing with only one ear | - |
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| monoclinal | (adjective) of a geological structure in which all strata are inclined in the same direction | - |
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| monoclonal | (adjective) forming or derived from a single clone | - |
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| monodical | (adjective) having a single vocal part | Synonyms: monodic |
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| monolingual | (adjective) using or knowing only one language | - |
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| monomaniacal | (adjective) obsessed with a single subject or idea | - |
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| monopteral | (adjective) having circular columniation | - |
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| monumental | (adjective) relating or belonging to or serving as a monument | - |
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| (adjective) imposing in size or bulk or solidity | Synonyms: massive, monolithic |
| (adjective) of outstanding significance | - |
| moral | (adjective) concerned with principles of right and wrong or conforming to standards of behavior and character based on those principles | - |
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| (adjective) psychological rather than physical or tangible in effect | - |
| morphological | (adjective) relating to or concerned with the morphology of plants and animals | Synonyms: morphologic, structural |
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| (adjective) relating to or concerned with the formation of admissible words in a language | Synonyms: morphologic |
| (adjective) pertaining to geological structure | Synonyms: geomorphologic, geomorphological, morphologic, structural |
| mortal | (adjective) subject to death | - |
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| (adjective) unrelenting and deadly | - |
| (adjective) involving loss of divine grace or spiritual death | Synonyms: deadly |
| (adjective) causing or capable of causing death | Synonyms: deadly, deathly |
| motional | (adjective) of or relating to or characterized by motion | - |
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| motivational | (adjective) of or relating to motivation | - |
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| motorial | (adjective) of nerves and nerve impulses; conveying information away from the CNS | Synonyms: efferent |
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| mucoidal | (adjective) relating to or resembling mucus | Synonyms: mucoid |
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| mucosal | (adjective) of or relating to mucous membranes | - |
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| multicultural | (adjective) of or relating to or including several cultures | - |
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| multidimensional | (adjective) having or involving or marked by several dimensions or aspects | - |
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| multifactorial | (adjective) involving or depending on several factors or causes (especially pertaining to a condition or disease resulting from the interaction of many genes) | - |
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| multilateral | (adjective) having many parts or sides | Synonyms: many-sided |
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| multilingual | (adjective) using or knowing more than one language | - |
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| multinational | (adjective) involving or operating in several nations or nationalities | Synonyms: transnational |
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| multinomial | (adjective) having the character of a polynomial | Synonyms: polynomial |
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| multiracial | (adjective) made up of or involving or acting on behalf of various races | - |
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| municipal | (adjective) relating or belonging to or characteristic of a municipality | - |
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| (adjective) of or relating to the government of a municipality | - |
| mural | (adjective) of or relating to walls | - |
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| musculoskeletal | (adjective) relating to muscles and skeleton | - |
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| musical | (adjective) characteristic of or resembling or accompanied by music | - |
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| (adjective) talented in or devoted to music | - |
| (adjective) containing or constituting or characterized by pleasing melody | Synonyms: melodic, melodious |
| (adjective) characterized by or capable of producing music | - |
| musicological | (adjective) of or relating to musicology | - |
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| mutational | (adjective) of or relating to or resulting from mutation | - |
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| mutual | (adjective) concerning each of two or more persons or things; especially given or done in return | Synonyms: reciprocal |
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| (adjective) common to or shared by two or more parties | Synonyms: common |
| myocardial | (adjective) of or relating to the myocardium | - |
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| mystical | (adjective) relating to or characteristic of mysticism | Synonyms: mystic |
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| (adjective) relating to or resembling mysticism | Synonyms: mystic |
| (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mysterious, mystic, occult, orphic, secret |
| mythical | (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: fabulous, mythic, mythologic, mythological |
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| mythological | (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: fabulous, mythic, mythical, mythologic |
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| narial | (adjective) of or relating to or near the nares | - |
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| nasal | (adjective) of or in or relating to the nose | Synonyms: rhinal |
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| (adjective) sounding as if the nose were pinched | Synonyms: adenoidal, pinched |
| nasopharyngeal | (adjective) of or relating to or located near the nasopharynx | - |
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| natal | (adjective) relating to or accompanying birth | - |
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| (adjective) of or relating to the buttocks | - |
| national | (adjective) limited to or in the interests of a particular nation | - |
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| (adjective) concerned with or applicable to or belonging to an entire nation or country | - |
| (adjective) of or relating to or belonging to a nation or country | - |
| (adjective) of or relating to nationality | - |
| (adjective) characteristic of or peculiar to the people of a nation | - |
| (adjective) inside the country | Synonyms: home, interior, internal |
| (adjective) owned or maintained for the public by the national government | - |
| natural | (adjective) (of a parent or child) related by blood; genetically related | Synonyms: biological |
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| (adjective) in accordance with nature; relating to or concerning nature | - |
| (adjective) existing in or produced by nature; not artificial or imitation | - |
| (adjective) existing in or in conformity with nature or the observable world; neither supernatural nor magical | - |
| (adjective) (of a musical note) being neither raised nor lowered by one chromatic semitone | - |
| (adjective) being talented through inherited qualities | Synonyms: born, innate |
| (adjective) functioning or occurring in a normal way; lacking abnormalities or deficiencies | - |
| (adjective) unthinking; prompted by (or as if by) instinct | Synonyms: instinctive |
| (adjective) free from artificiality | Synonyms: lifelike |
| (adjective) (used especially of commodities) being unprocessed or manufactured using only simple or minimal processes | Synonyms: raw, rude |