18-letter words containing p, o, t, h

speech recognition — Computers. the computerized analysis of spoken words in order to identify the speaker, as in security systems, or to respond to voiced commands: the analysis is performed by finding patterns in the spectrum of the incoming sound and comparing them with stored patterns of elements of sound, as phones, or of complete words.
spherical geometry — the branch of geometry that deals with figures on spherical surfaces.
spike-tooth harrow — a harrow equipped with straight teeth on horizontal bars, usually employed to smooth and level plowed soil or seedbeds for planting or sowing.
spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
spur-of-the-moment — occurring or done without advance preparation or deliberation; extemporaneous; unplanned: a spur-of-the-moment decision.
superstring theory — any supersymmetric string theory in which each type of elementary particle is treated as a vibration of a single fundamental string (superstring) at a particular frequency.
supportive therapy — any treatment, such as the intravenous administration of certain fluids, designed to reinforce or sustain the physiological well-being of a patient
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.
take the wraps off — to reveal
telephone exchange — a telecommunications facility to which subscribers' telephones connect, that switches calls among subscribers or to other exchanges for further routing.
telephone receiver — a device, as in a telephone, that converts changes in an electric current into sound.
telephone sex line — a telephone line operated by a phone-sex worker that offers phone sex to paying customers
temporary hardness — hardness of water due to the presence of magnesium and calcium hydrogencarbonates, which can be precipitated as carbonates by boiling
the better part of — a large part of
the bottomless pit — the underworld; hell
the encyclopedists — the writers of the French Encyclopedia (1751-72) edited by Diderot and d'Alembert, which contained the advanced ideas of the period
the family compact — the ruling oligarchy in Upper Canada in the early 19th century
the heavens opened — it started pouring with rain
the lords temporal — (in Britain) peers other than bishops in their capacity as members of the House of Lords
the operative word — If you describe a word as the operative word, you want to draw attention to it because you think it is important or exactly true in a particular situation.
the palmetto state — a nickname for South Carolina
the powers that be — You can refer to people in authority as the powers that be, especially when you want to say that you disagree with them or do not understand what they say or do.
the-cocktail-party — a play in verse (1950) by T. S. Eliot.
thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
thought experiment — Physics. a demonstration or calculation that is based on the postulates of a theory, as relativity, and that demonstrates or clarifies the consequences of the postulates.
three-body problem — the problem of calculating the motions of three bodies in space moving under the influence of only their mutual gravitational attraction.
tip of the iceberg — a large floating mass of ice, detached from a glacier and carried out to sea.
to gussy sb/sth up — to give (a person or thing) a smarter or more interesting appearance
to hold your peace — If you hold or keep your peace, you do not speak, even though there is something you want or ought to say.
to learn the ropes — If you are learning the ropes, you are learning how a particular task or job is done.
to lick into shape — If you lick, knock, or whip someone or something into shape, you use whatever methods are necessary to change or improve them so that they are in the condition that you want them to be in.
to open your heart — If you open your heart or pour out your heart to someone, you tell them your most private thoughts and feelings.
to pick and choose — If you pick and choose, you carefully choose only things that you really want and reject the others.
to plough a furrow — If you say that someone ploughs a particular furrow or ploughs their own furrow, you mean that their activities or interests are different or isolated from those of other people.
to spill the beans — If you spill the beans, you tell someone something that people have been trying to keep secret.
to stop at nothing — If you say that someone will stop at nothing to get something, you are emphasizing that they are willing to do things that are extreme, wrong, or dangerous in order to get it.
to sweep the board — If someone sweeps the board in a competition or election, they win nearly everything that it is possible to win.
to take the plunge — If you take the plunge, you decide to do something that you consider difficult or risky.
to watch your step — If someone tells you to watch your step, they are warning you to be careful about how you behave or what you say so that you do not get into trouble.
triphosphoric acid — the hypothetical acid H 5 P 3 O 10 , known chiefly by its salts.
up to the eyeballs — You use up to the eyeballs to emphasize that someone is in an undesirable state to a very great degree.
upper palaeolithic — the latest of the three periods of the Palaeolithic, beginning about 40 000 bc and ending, in Europe, about 12 000 bc: characterized by the emergence of modern man, Homo sapiens
vectorcardiography — a method of determining the direction and magnitude of the electrical forces of the heart.
warehouse capacity — the amount of storage space in a warehouse
white iron pyrites — marcasite
white-spotted hyla — a type of tree frog (H. leucophyllata) of tropical America
wireless telephone — Now Rare. radiotelephony.
wireless telephony — Now Rare. radiotelephony.
withdrawal symptom — effects of stopping a drug

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