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18-letter words containing a, l, t, m, i

  • particulate matter — Particulate matter is solid or liquid particles in the air, which are measured in PM-10 units and are particles with a diameter of ten micrometers or less.
  • passing modulation — a modulation of a temporary nature.
  • pathologic anatomy — the branch of pathology dealing with the morphologic changes in tissues.
  • perceptual mapping — the use of a graph or map in the development of a new product, in which the proximity of consumers' images of the new product to those of an ideal product provide an indication of the new product's likely success
  • personal exemption — Your personal exemption is the amount of money that is deducted from your gross income before you have to start paying income tax.
  • phantasmagorically — having a fantastic or deceptive appearance, as something in a dream or created by the imagination.
  • phantom withdrawal — the unauthorized removal of funds from a bank account using an automated teller machine
  • philharmonic pitch — a standard of pitch in which A above middle C is established at 440 vibrations per second.
  • photochemical smog — air pollution containing ozone and other reactive chemical compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, especially those in automobile exhaust.
  • physical chemistry — the branch of chemistry dealing with the relations between the physical properties of substances and their chemical composition and transformations.
  • phytohemagglutinin — a lectin, obtained from the red kidney bean, that binds to the membranes of T cells and stimulates metabolic activity, cell division, etc.
  • pig-tailed macaque — a forest-dwelling southeast Asian macaque, Macaca nemestrina, having a short, curled tail, colonized for animal behavior studies.
  • plane trigonometry — the branch of trigonometry dealing with plane triangles.
  • plenum ventilation — a system of mechanical ventilation in which fresh air is forced into the spaces to be ventilated from a chamber (plenum chamber) at a pressure slightly higher than atmospheric pressure, so as to expel foul air.
  • policeman's helmet — a Himalayan balsaminaceous plant, Impatiens glandulifera, with large purplish-pink flowers, introduced into Britain
  • politically-minded — (of a person or group of people) interested in the way power is achieved and used in a country or society (through government, policy-making, etc)
  • polychromatophilic — having an affinity for more than one kind of stain, especially for acid, neutral, and basic stains, as polychromatophilic erythroblasts characteristic of pernicious anemia.
  • population pyramid — a graph showing the distribution of a population by sex, age, etc.
  • portable equipment — Portable equipment is electrical equipment that can easily be moved from one place to another while in operation or while connected to the supply.
  • postmillenarianism — postmillennialism.
  • postviral syndrome — debilitating condition occurring as a sequel to viral illness
  • potassium chlorate — a white or colorless, crystalline, water-soluble, poisonous solid, KClO 3 , used chiefly as an oxidizing agent in the manufacture of explosives, fireworks, matches, bleaches, and disinfectants.
  • potassium chloride — a white or colorless, crystalline, water-soluble solid, KCl, used chiefly in the manufacture of fertilizers and mineral water, and as a source of other potassium compounds.
  • potassium fluoride — a white, crystalline, hygroscopic, toxic powder, KF, used chiefly as an insecticide, a disinfectant, and in etching glass.
  • potassium sulphate — a soluble substance usually obtained as colourless crystals of the decahydrate: used in making glass and as a fertilizer. Formula: K2SO4
  • preantepenultimate — third from the end.
  • presenile dementia — a form of dementia, of unknown cause, starting before a person is old
  • pressure altimeter — an aneroid barometer adapted for measuring altitude by converting the indicated atmospheric pressure to altitude according to a standard relationship.
  • presumption of law — a presumption based upon a policy of law or a general rule and not upon the facts or evidence in an individual case.
  • primate of england — a title of the archbishop of Canterbury.
  • principal argument — the radian measure of the argument between −π and π of a complex number. Compare argument (def 8c).
  • proportional limit — elastic limit.
  • public examination — an examination, such as a GCSE exam, that is set by a central examining board
  • publicity campaign — an effort to convey information to the public
  • pulmonic airstream — a current of lung air set in motion by the respiratory muscles in the production of speech.
  • quartz-iodine lamp — a type of tungsten-halogen lamp containing small amounts of iodine and having a quartz envelope, operating at high temperature and producing an intense light for use in car headlamps, etc
  • quasi-metaphysical — pertaining to or of the nature of metaphysics.
  • racially motivated — motivated by (the hate or prejudice of) someone's race
  • real-time computer — a computer that can process data or information almost immediately
  • relative major key — a major key that has the same key signature as a minor key, but a different tonic
  • relative minor key — a minor key that has the same key signature as a major key, but a different tonic
  • replacement engine — an engine used to replace or substitute an older or broken engine (in a vehicle, etc)
  • residual magnetism — remanence.
  • resistance plasmid — any of a group of bacterial plasmids carrying genetic information that provide resistance to antibiotic drugs: some resistance plasmids are able to transfer themselves, and hence resistance, during conjugation
  • rotational molding — a method for molding hollow plastic objects by placing finely divided particles in a hollow mold that is rotated about two axes, exposing it to heat and then to cold.
  • running martingale — martingale (def 2).
  • rural municipality — any lightly settled area in Canada lacking a local elected government and administered directly by a provincial government.
  • sacrificial victim — a person who is ritually killed with the intention of propitiating or pleasing a deity
  • salem witch trials — 17th-century witchcraft case
  • sampling equipment — Sampling equipment is equipment which is used to remove small amounts of something for analysis and monitoring.
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