19-letter words containing h, y, a

pyrophosphoric acid — a crystalline, water-soluble powder, H 4 P 2 O 7 , formed by the union of one molecule of phosphorus pentoxide with two molecules of water.
pythagoras' theorem — (spelling) It's Pythagoras's Theorem.
pythagorean theorem — Pythagoras's Theorem
radiochromatography — chromatography in which radiolabeled substances on the chromatogram are determined quantitatively or qualitatively by measuring their radioactivity.
rayleigh scattering — the scattering of light by particles that are very small in relation to the wavelength of the light, and in which the intensity of the scattered light varies inversely with the fourth power of the wavelength.
refreshable display — braille display
research laboratory — place for scientific experimentation
rhythmic gymnastics — a form of gymnastics involving movements using hand apparatus such as balls, hoops, and ribbons
saint swithin's day — July 15, superstitiously regarded as a day that, should it rain or be fair, will be followed by 40 consecutive days of like weather.
salvage archaeology — the collection of archaeological data and materials from a site in danger of imminent destruction, as from new construction or flooding.
semidetached binary — a pair of stars that are so close together that mass transfer occurs from one to the other
short-stay car park — a car park where a car can be left for a relatively short time
simple carbohydrate — a carbohydrate, as glucose, that consists of a single monosaccharide unit.
sleepy hollow chair — an armchair of the mid-19th century, sometimes on rockers, having a single piece forming a high upholstered back and a concave upholstered seat.
smooth the path/way — If you smooth the path or smooth the way towards something, you make it easier or more likely to happen.
social anthropology — study of human culture
solid-state physics — the branch of physics that deals with the macroscopic physical properties of matter, especially solids; the study of the electromagnetic, structural, and thermodynamic properties of solids.
spherical astronomy — the branch of astronomy dealing with the determination of the positions of celestial bodies on the celestial sphere.
st. anthony's cross — a T -shaped cross.
steady state theory — a theory in which the universe is assumed to have average properties that are constant in space and time so that new matter must be continuously and spontaneously created to maintain average densities as the universe expands.
steady-state theory — a cosmological theory postulating that the universe exists throughout time in a steady state such that the average density of matter does not vary with distance or time. Matter is continuously created in the space left by the receding stars and galaxies of the expanding universe
sympathetic contact — behavior toward an individual based on the individual's personal makeup rather than on his or her group membership.
symptomatic anthrax — blackleg.
synchromesh gearbox — A synchromesh gearbox is a usually manually operated transmission in which a change of gears takes place between gears that are already revolving at the same speed.
synchronous machine — an alternating-current machine in which the average speed of normal operation is exactly proportional to the frequency of the system to which it is connected.
take sth personally — If you take someone's remarks personally, you are upset because you think that they are criticizing you in particular.
tetrachloroethylene — a colorless, nonflammable, nonexplosive liquid, C 2 Cl 4 , used as a solvent, especially in dry cleaning.
tetrafluoroethylene — a colorless, water-insoluble, flammable gas, C 2 F 4 , used in the synthesis of certain polymeric resins, as Teflon.
tetramethyldiarsine — an oily slightly water-soluble poisonous liquid with garlic-like odour. Its derivatives are used as accelerators for rubber
the admiralty board — (formerly) a department of the British Ministry of Defence, responsible for the administration and planning of the Royal Navy
the almighty dollar — money regarded figuratively as a god, or source of great power
the channel country — an area of E central Australia, in SW Queensland: crossed by intermittent rivers and subject to both flooding and long periods of drought
the eroica symphony — Symphony No. 3 in E flat major by Ludwig van Beethoven
the heat of the day — The heat of the day is the hottest part of the day, especially when this is very hot.
the high and mighty — people who are considered very important
the london assembly — the devolved legislature of London, based in City Hall, Southwark
theoretical physics — abstract use of physics
theory of equations — the branch of mathematics dealing with methods of finding the solutions to algebraic equations.
to bury the hatchet — If two people bury the hatchet, they become friendly again after a quarrel or disagreement.
to change your mind — If you change your mind, or if someone or something changes your mind, you change a decision you have made or an opinion that you had.
to change your tune — If you say that someone has changed their tune, you are criticizing them because they have changed their opinion or way of doing things.
to hang by a thread — If you say that something is hanging by a thread, you mean that it is in a very uncertain state and is unlikely to survive or succeed.
to have it off/away — To have it off with someone or have it away with someone means to have sex with them.
to hold your breath — If you hold your breath, you make yourself stop breathing for a few moments, for example because you are under water.
to lay down the law — If you say that someone lays down the law, you are critical of them because they give other people orders and they think that they are always right.
to play hard to get — If someone plays hard to get, they pretend not to be interested in another person or in what someone is trying to persuade them to do.
typographical error — an error in printed or typewritten matter resulting from striking the improper key of a keyboard, from mechanical failure, or the like.
ultrahigh frequency — any frequency between 300 and 3000 megahertz. Abbreviation: UHF, uhf.
ultramicrochemistry — the branch of microchemistry dealing with minute quantities of material weighing one microgram or less.
university hospital — a hospital that is affiliated with a university. University hospitals provide clinical education and training to future and current doctors, nurses, and other health professionals, in addition to delivering medical care to patients

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