18-letter words containing a, e, c, h, m

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.
plumber's merchant — a shop or business that sells things needed for the job of installing and repairing pipes, fixtures, etc, for water, drainage, and gas
policeman's helmet — a Himalayan balsaminaceous plant, Impatiens glandulifera, with large purplish-pink flowers, introduced into Britain
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.
processionary moth — a moth of the family Thaumetopoeidae, esp the oak processionary moth (Thaumetopoea processionea), the larvae of which leave the communal shelter nightly for food in a V-shaped procession
programmer's cheer — (humour) "Shift to the left! Shift to the right! Pop up, push down! Byte! Byte! Byte!" [Origin?]
projection machine — an apparatus that projects motion pictures; projector.
propaganda machine — the group of people, publications, etc, such as of a government, country etc, responsible for the organized dissemination of information, allegations, etc, to assist or damage the cause of a government, movement, etc
provision merchant — a person or company in the business of retailing food and other provisions
psychogalvanometer — a type of galvanometer for detecting and measuring psychogalvanic currents.
pyromucic aldehyde — furfural.
quasi-metaphysical — pertaining to or of the nature of metaphysics.
quick off the mark — If you are quick off the mark, you are quick to understand or respond to something. If you are slow off the mark, you are slow to understand or respond to something.
reach for the moon — to desire or attempt something unattainable or difficult to obtain
repayment schedule — a document detailing the specific terms of a borrower's loan, such as monthly payment, interest rate, due dates etc
richard p. feynman — (person, computing, architecture) /fayn'mn/ 1918-1988. A US physicist, computer scientist and author who graduated from Massachusetts Institute of Technology and Princeton. Feynmane was a key figure in helping Oppenheimer and team develop atomic bomb. In 1950 he became a professor at Caltech and in 1965 became Nobel Prize Laureate in Physics for QED (quantum electrodynamics). He was a primary figure in "solving" the Challenger disaster O-ring problem. He "rediscovered" the former Soviet Socialist Republic of Tuva. The 2001 film "Infinity" about Feynman's early life featured Matthew Broderick and Patricia Arquette. In 2001, "QED", a play about Feynman's life featuring Alan Alda opened.
roman architecture — buildings in style of ancient Rome
salem witch trials — 17th-century witchcraft case
schengen agreement — an agreement, signed in 1985 at a meeting of European leaders near Schengen, Luxembourg, but not implemented until 1995, to gradually abolish border controls within Europe; it was supplemented in 1990 by the Schengen Convention; in 1999 the agreement was incorporated into European Union law. Twenty-six countries acceded by 2015; the UK is not a signatory
sodium thiocyanate — a white powder or colorless, deliquescent crystals, NaSCN, used chiefly in organic synthesis and in medicine in the treatment of hypertension.
southern cameroons — German Kamerun. a region in W Africa: a German protectorate 1884–1919; divided in 1919 into British and French mandates.
spherical geometry — the branch of geometry that deals with figures on spherical surfaces.
stem-cell research — research that is carried out on stem cells for use in medicine
stinking chamomile — mayweed.
stoichiometrically — of or relating to stoichiometry.
stokely carmichael — Hoagland Howard [hohg-luh nd] /ˈhoʊg lənd/ (Show IPA), ("Hoagy") 1899–1981, U.S. songwriter and musician.
stomach sweetbread — sweetbread (def 1).
submarine sandwich — a sandwich made with a long cylindrical bread roll
survival mechanism — something you or your body does automatically, in order to survive in a dangerous or unpleasant situation
swedish gymnastics — a system of passive and active exercising of muscles and joints
sympathetic strike — sympathy strike.
sympathetic string — a thin wire string, as in various obsolete musical instruments, designed to vibrate sympathetically with the bowed or plucked strings to reinforce the sound.
symphony orchestra — a large orchestra composed of wind, string, and percussion instruments and organized to perform symphonic compositions.
systematic phoneme — a phonological unit in generative phonology representing an underlying form that takes into account the relationship between phonological patterns and morphological variation, as the unit underlying the second vowel in both derive and derivative.
teaching equipment — teaching aids
tetrachloromethane — carbon tetrachloride.
the american dream — the notion that the American social, economic, and political system makes success possible for every individual
the black mountain — a mountain range in S Wales, in E Carmarthenshire and W Powys. Highest peak: Carmarthen Van, 802 m (2632 ft)
the dismal science — a name for economics coined by Thomas Carlyle
the family compact — the ruling oligarchy in Upper Canada in the early 19th century
the hunger marches — a number of processions by unemployed workers in the 1930s to protest against unemployment and deprivation
thermal efficiency — the ratio of the work output of a heat engine to the heat input expressed in the same units of energy.
thermonuclear bomb — hydrogen bomb.
to cut the mustard — If someone does not cut the mustard, their work or their performance is not as good as it should be or as good as it is expected to be.
to meet your match — If you meet your match, you find that you are competing or fighting against someone who you cannot beat because they are as good as you, or better than you.
to take the mickey — If you take the mickey out of someone or something, you make fun of them, usually in an unkind way.
two-chamber system — the system of having two parliamentary chambers, as the House of Lords and the House of Commons in the United Kingdom
watchdog committee — a committee responsible for monitoring standards of behaviour

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