13-letter words containing a, m, i, t, r
- antiritualism — opposed to ritualism
- antisubmarine — (of weapons, missiles, etc) designed to combat or destroy submarines
- antisymmetric — (of a relation) never holding between a pair of arguments x and y when it holds between y and x except when x = y, as "…is no younger than…"
- antiterrorism — opposed to or acting against terrorism; counterterrorist
- apogeotropism — negative geotropism, as shown by plant stems
- apoplectiform — of or resembling apoplexy or stroke.
- apparent time — Astronomy. local time measured by the hour angle of the sun.
- apportionment — the act of apportioning
- approximately — close to; around; roughly or in the region of
- approximating — Present participle of approximate.
- approximation — An approximation is a fact, object, or description which is similar to something else, but which is not exactly the same.
- approximative — (of a method, description, etc.) giving only an approximation to something.
- araeometrical — relating to araeometry
- archaeometric — relating to archaeometry
- archimandrite — the head of a monastery or a group of monasteries
- argumentation — Argumentation is the process of arguing in an organized or logical way, for example in philosophy.
- argumentative — Someone who is argumentative is always ready to disagree or start quarrelling with other people.
- aristocratism — the principles of aristocrats
- arithmetician — a person skilled in arithmetic
- arithmophobia — the fear of numbers
- arm wrestling — a contest in which two people sit facing each other each with one elbow resting on a table, clasp hands, and each tries to force the other's arm flat onto the table while keeping his own elbow touching the table
- armamentarium — the items that comprise the material and equipment used by a physician in his professional practice
- armistice day — the anniversary of the signing of the armistice that ended World War I, on Nov 11, 1918, now kept on Remembrance Sunday
- armor-plating — The armor-plating on a vehicle or building is the hard metal covering that is intended to protect it from gunfire and other missiles.
- armstand dive — a dive starting from a handstand at the end of a springboard or a platform with the diver's back to the water.
- aromatization — the conversion of aliphatic or alicyclic compounds to aromatic hydrocarbons.
- ascertainment — to find out definitely; learn with certainty or assurance; determine: to ascertain the facts.
- astrodynamics — the study of the motion of natural and artificial bodies in space
- atmospherical — pertaining to, existing in, or consisting of the atmosphere: atmospheric vapors.
- atomic energy — nuclear energy
- atomic number — the number of protons in the nucleus of an atom of an element
- atomic theory — any theory in which matter is regarded as consisting of atoms, esp that proposed by John Dalton postulating that elements are composed of atoms that can combine in definite proportions to form compounds
- australianism — the Australian national character or spirit
- autapomorphic — (biology) Describing any characteristic that has evolved in only a single species (or other taxon).
- autoeroticism — the arousal and use of one's own body as a sexual object, as through masturbation
- autoradiogram — autoradiograph
- avant-gardism — the attitudes, techniques, etc., of the cultural avant-garde.
- azurmalachite — a blue-green ornamental stone consisting of a mixture of azurite and malachite.
- backformation — Alternative spelling of back-formation.
- bartholomew i — (Dimitrios Archontonis) born 1940, Archbishop of Constantinople and Ecumenical Patriarch of the Eastern Orthodox Church since 1991.
- battering ram — A battering ram is a long heavy piece of wood that is used to knock down the locked doors of buildings.
- battering-ram — an ancient military device with a heavy horizontal ram for battering down walls, gates, etc.
- beam splitter — a system that divides a beam of light, electrons, etc, into two or more paths
- bergamot mint — an aromatic herb, Mentha piperita citrata, having a lemonlike odor when crushed.
- biculturalism — the characteristics, or policy, of a two-cultured society
- binary system — a system involving only two elements, as 0 and 1 or yes and no.
- bipartisanism — the quality of being bipartisan
- bitter almond — a variety of almond whose bitter seeds yield hydrocyanic acid upon hydrolysis
- blamestorming — a discussion or meeting for the purpose of assigning blame.
- board meeting — a meeting of the board of a company or other organization