13-letter words containing a, c, m, t, i
- anomalistical — relating to a planet's angular distance from its last perihelion or orbital point nearest to the sun
- ante-christum — before Christ. Abbreviation: A.C.
- anthelminthic — Of use against intestinal worms.
- anthelmintics — Plural form of anthelmintic.
- anti-academic — of or relating to a college, academy, school, or other educational institution, especially one for higher education: academic requirements.
- anti-american — opposed to anything of or relating to the United States of America
- anti-dogmatic — relating to or of the nature of a dogma or dogmas or any strong set of principles concerning faith, morals, etc., as those laid down by a church; doctrinal: We hear dogmatic arguments from both sides of the political spectrum.
- anti-macassar — a small covering, usually ornamental, placed on the backs and arms of upholstered furniture to prevent wear or soiling; a tidy.
- anti-monarchy — a state or nation in which the supreme power is actually or nominally lodged in a monarch. Compare absolute monarchy, limited monarchy.
- anti-romantic — of, relating to, or of the nature of romance; characteristic or suggestive of the world of romance: a romantic adventure.
- antiasthmatic — An antiasthmatic is any drug that relieves the symptoms of asthma.
- anticlimactic — of, having, or like an anticlimax
- anticlinorium — a vast elongated anticline with its strata further folded into anticlines and synclines
- anticommunism — the opposition to communism
- anticommunist — (initial capital letter) a member of the Communist Party or movement.
- antiempirical — Going against what is empirically true.
- antimacassars — Plural form of antimacassar.
- antimechanist — opposed to mechanistic philosophy
- antimetabolic — inhibiting metabolism
- antimicrobial — capable of destroying or inhibiting the growth of disease-causing microbes
- antimutagenic — capable of reducing the frequency of mutation.
- antirheumatic — acting against rheumatism
- antisepticism — the treatment of sepsis using antiseptics
- antisocialism — the quality of being antisocial
- antispasmodic — preventing or arresting spasms, esp in smooth muscle
- 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…"
- apologeticism — An instance of the use of apologetics.
- apomictically — in an apomictic manner
- apophlegmatic — having the ability to remove phlegm
- apoplectiform — of or resembling apoplexy or stroke.
- araeometrical — relating to araeometry
- archaeometric — relating to archaeometry
- archimandrite — the head of a monastery or a group of monasteries
- aristocratism — the principles of aristocrats
- arithmetician — a person skilled in arithmetic
- armistice day — the anniversary of the signing of the armistice that ended World War I, on Nov 11, 1918, now kept on Remembrance Sunday
- ascertainment — to find out definitely; learn with certainty or assurance; determine: to ascertain the facts.
- aschelminthes — a major grouping (formerly a phylum) of small-to-microscopic pseudocoelomate organisms, as the rotifers, nematodes, and gastrotriches, all of which are now classified as separate phyla.
- asthmatically — In an asthmatic manner.
- astrodynamics — the study of the motion of natural and artificial bodies in space
- atamasco lily — any of a genus (Zephyranthes) of bulbous plants of the lily family, with hollow stems, grassy leaves, and funnel-shaped flowers of yellow, pink, red, or purple-tinged white
- athematically — in an athematic manner
- atlantic time — the civil time officially adopted for a country or region, usually the civil time of some specific meridian lying within the region. The standard time zones in the U.S. (Atlantic time, Eastern time, Central time, Mountain time, Pacific time, Yukon time, Alaska-Hawaii time, and Bering time) use the civil times of the 60th, 75th, 90th, 105th, 120th, 135th, 150th, and 165th meridians respectively, the difference of time between one zone and the next being exactly one hour.
- 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
- atomic volume — the atomic weight (relative atomic mass) of an element divided by its density
- atomic weapon — a weapon in which energy is provided by nuclear fission
- atomic weight — the weight of one atom of an element expressed in atomic mass units: it is the average weight of all the isotopes of the element