12-letter words containing a, o, r, i, s
- manoeuvrings — Plural form of manoeuvring.
- marcatissimo — in a heavily accented manner
- marconi mast — an elaborately stayed mast.
- 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).
- 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.
- marsh orchid — any of various orchids of the genus Dactylorhiza, growing in damp places and having mostly purplish flowers
- master point — a point awarded to a bridge player who has won or placed in an officially recognized tournament.
- 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.
- matriclinous — Having mostly maternally-inherited characteristics.
- matrimonials — Plural form of matrimonial.
- matroclinous — inheritance in which the traits of the offspring are derived primarily from the maternal parent (opposed to patrocliny).
- 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.
- media person — a person who works in the mass media
- mediatorship — the position of a mediator
- memorialised — Simple past tense and past participle of memorialise.
- memorialists — Plural form of memorialist.
- memorializes — (US) Third-person singular simple present indicative form of memorialize.
- memorisation — Alternative spelling of memorization.
- menstruation — the periodic discharge of blood and mucosal tissue from the uterus, occurring approximately monthly from puberty to menopause in nonpregnant women and females of other primate species.
- mesoamerican — Alternative form of Mesoamerican.
- mesocortical — Of or pertaining to the mesocortex.
- mesogastrium — the mesentery of the embryonic stomach.
- metachronism — An error in chronological ordering in which a character or an event is placed at too late a time.
- metamorphism — Geology. a change in the structure or constitution of a rock due to natural agencies, as pressure and heat, especially when the rock becomes harder and more completely crystalline.
- metamorphist — a member of a group of 16th century Christians who believed that the humanly body of Jesus Christ metamorphosed into God during the Ascension
- microamperes — Plural form of microampere.
- microanalyst — One who carries out microanalysis.
- microcapsule — a tiny capsule, 20–150 microns in diameter, used for slow-release application of drugs, pesticides, flavors, etc.
- microcrystal — a microscopic crystal.
- microphagous — (of an animal) feeding on small particles of food
- microphallus — The condition of having an abnormally small penis; micropenis.
- microreaders — Plural form of microreader.
- microstation — (application) A full-featured 2-D and 3-D CAD program for MS-DOS, Microsoft Windows, Macintosh, and Unix workstations from Bentley Systems, Inc. Created in 1984, MicroStation is a high-end package used worldwide in environments where many designers work on large, complex projects. MicroStation Modeler is a superset of MicroStation that provides solid modelling, and MasterPiece is MicroStation's rendering and animation program.
- migrationist — a person who considers it important for species of animals and plants to migrate for the purposes of distribution and evolution
- millionaires — Plural form of millionaire.
- mineralogies — Plural form of mineralogy.
- mineralogist — the science or study of minerals.
- ministration — the act of ministering care, aid, religious service, etc.
- miraculously — In a miraculous manner.
- misanthropes — Plural form of misanthrope.
- misanthropic — of, relating to, or characteristic of a misanthrope.
- misbehaviour — (British) alternative spelling of misbehavior.
- miscegenator — a person who advocates or engages in miscegenation
- misconstrual — A misinterpretation of the meaning of something.
- miscreations — Plural form of miscreation.
- misdemeanors — Plural form of misdemeanor.
- misdemeanour — Law. a criminal offense defined as less serious than a felony.