12-letter words containing m, o, a, r
- mare humorum — (Sea of Moisture) a dark plain in the third quadrant of the face of the moon: about 45,000 sq. mi. (117,000 sq. km).
- mare nostrum — our sea, especially the Mediterranean to the ancient Romans.
- mare vaporum — (Sea of Vapors) a dark plain in the first quadrant and near the center of the face of the moon: about 39,000 sq. mi. (101,000 sq. km).
- marie louise — 1791–1847, 2nd wife of Napoleon I: empress of France; duchess of Parma 1816–31 (daughter of Francis II of Austria; mother of Napoleon II).
- marimbaphone — (obsolete, music) A kind of percussion idiophone, like the marimba but with steel keys instead of wood, developed in early 20th century United States.
- marine borer — any mollusc or crustacean that lives usually in warm seas and destroys wood by boring into and eating it. The gribble and shipworm are the best known since they penetrate any wood in favourable water
- marine corps — a branch of the U.S. Armed Forces trained for land, sea, and air combat, typically for land combat in conjunction with an amphibious or airborne landing, and whose commandant is responsible to the secretary of the navy.
- marionettist — A puppeteer who controls a marionette.
- mark out for — to select for or note as selected for
- market cross — a place in a town or village where a cross was set up and a regular market was held
- market order — an order to buy or sell a specified amount of a security at the best price available.
- markov chain — a Markov process restricted to discrete random events or to discontinuous time sequences.
- markov model — (probability, simulation) A model or simulation based on Markov chains.
- marsh mallow — an Old World mallow, Althaea officinalis, having pink flowers, found in marshy places.
- marsh orchid — any of various orchids of the genus Dactylorhiza, growing in damp places and having mostly purplish flowers
- marshalltown — a city in central Iowa.
- marshmallows — Plural form of marshmallow.
- marshmallowy — Similar to a marshmallow.
- marston moor — a former moor in NE England, west of York: Cromwell's victory over the Royalists 1644.
- marvellously — In a marvellous manner.
- mary of teck — Mary (def 4).
- mass-produce — to produce or manufacture (goods) in large quantities, especially by machinery.
- massotherapy — treatment by massage.
- master alloy — an alloy rich in certain elements, used in small quantities as an additive to melts of alloyed metal.
- master mason — (often initial capital letters) a Freemason who has reached the third degree.
- master point — a point awarded to a bridge player who has won or placed in an officially recognized tournament.
- masterstroke — a masterly action or achievement; an extremely skillful or effective action: War was avoided by a masterstroke of diplomacy.
- mastigophora — a phylum of protozoans comprising nonphotosynthetic, chiefly free-living flagellates: some species are important pathogens of humans and other animals.
- mastigophore — Any flagellate of the phylum Mastigophora.
- masturbation — the stimulation or manipulation of one's own genitals, especially to orgasm; sexual self-gratification.
- masturbatory — the stimulation or manipulation of one's own genitals, especially to orgasm; sexual self-gratification.
- matriclinous — Having mostly maternally-inherited characteristics.
- matriculator — to enroll in a college or university as a candidate for a degree.
- matrimonials — Plural form of matrimonial.
- matroclinous — inheritance in which the traits of the offspring are derived primarily from the maternal parent (opposed to patrocliny).
- matto grosso — Mato Grosso.
- maturational — the act or process of maturating.
- meadow grass — any grass of the genus Poa, especially P. pratensis, the Kentucky bluegrass.
- measure zero — the property of a set of points for which, given any small number, there exists a set of intervals such that each point of the given set is contained in at least one of the intervals and such that, essentially, the combined length of the intervals is less than the small number.
- mechatronics — The synergistic combination of mechanical engineering, electronic engineering and software engineering for the study of automata from an engineering perspective and the control of advanced hybrid systems.
- medal-holder — a person who has won a medal
- media person — a person who works in the mass media
- mediatorship — the position of a mediator
- megalocardia — hypertrophy of the heart.
- meganthropus — a proposed genus of extinct, late lower Pleistocene primates based on two large lower jaws found in Java, and believed to be either Australopithecine or human.
- melanochroic — Melanochroid
- melanogaster — Any of several fungi of the genus Melanogaster.
- melanophores — Plural form of melanophore.
- melanotropin — MSH.
- melodramatic — of, like, or befitting melodrama.