18-letter words containing r, h, g

song without words — a song which only consists of a tune or melody and does not have any lyrics
sound spectrograph — an electronic device for recording a sound spectogram.
sow dragon's teeth — to take some action that is intended to prevent strife or trouble but that actually brings it about
spectroheliography — the process of obtaining an image of the sun in light of a particular wavelength, such as calcium or hydrogen, showing the distribution of the element over the surface and in the solar atmosphere, using a spectroheliograph
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.
spherical triangle — a triangle formed by arcs of great circles of a sphere.
strathclyde region — a former local government region in W Scotland: formed in 1975 from Glasgow, Renfrewshire, Lanarkshire, Buteshire, Dunbartonshire, and parts of Argyllshire, Ayrshire, and Stirlingshire; replaced in 1996 by the council areas of Glasgow, Renfrewshire, East Renfrewshire, Inverclyde, North Lanarkshire, South Lanarkshire, Argyll and Bute, East Dunbartonshire, West Dunbartonshire, North Ayrshire, South Ayrshire, and East Ayrshire
stratigraphic trap — A stratigraphic trap is a rock formation that contains hydrocarbons and is sealed by other rock formations.
stretch one's legs — either of the two lower limbs of a biped, as a human being, or any of the paired limbs of an animal, arthropod, etc., that support and move the body.
super middleweight — a boxer weighing up to 168 pounds (75.6 kg), between middleweight and light heavyweight.
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.
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.
synthetic geometry — elementary geometry, as distinct from analytic geometry.
technical sergeant — a noncommissioned officer ranking below a master sergeant and above a staff sergeant.
the class struggle — the continual conflict between the capitalist and working classes for economic and political power
the electronic age — the electronic age began when electronic equipment, including computers came into use
the general public — the people in a society; people in general
the grand national — an annual steeplechase run at Aintree, Liverpool, since 1839
the hunger marches — a number of processions by unemployed workers in the 1930s to protest against unemployment and deprivation
the major rogation — April 25, observed by Christians as a day of solemn supplication for the harvest and marked by processions, special prayers, and blessing of the crops
the nether regions — the genitals
the passenger seat — the seat used by a passenger of a car, beside the driver
theodore gericault — (Jean Louis André) Théodore [zhahn lwee ahn-drey tey-aw-dawr] /ʒɑ̃ lwi ɑ̃ˈdreɪ teɪ ɔˈdɔr/ (Show IPA), 1791–1824, French painter.
there you go again — Phrases such as there you go again are used to show annoyance at someone who is repeating something that has annoyed you in the past.
there's no telling — You use there's no telling to introduce a statement when you want to say that it is impossible to know what will happen in a situation.
thermogalvanometer — a thermoammeter for measuring small currents, consisting of a thermocouple connected to a direct-current galvanometer.
thin on the ground — If people or things of a particular kind are thin on the ground, there are very few of them.
third man argument — (in the philosophy of Aristotle) the argument against the existence of Platonic Forms that since the Form of Man is itself a perfect man, a further form (the "third" man) would be required to explain this, and so ad infinitum
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-day eventing — participation in a three day equestrian competition consisting of dressage, cross-country jumping, and stadium jumping
tip of the iceberg — a large floating mass of ice, detached from a glacier and carried out to sea.
to a grinding halt — If you describe a bad situation as grinding, you mean it never gets better, changes, or ends.
to be caught short — If you are caught short or are taken short, you feel a sudden strong need to urinate, especially when you cannot easily find a toilet.
to grit your teeth — If you grit your teeth, you make up your mind to carry on even if the situation is very difficult.
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.
under the aegis of — guided or protected by
university heights — a city in NE Ohio, near Cleveland.
urban homesteading — homesteading (def 2).
vectorcardiography — a method of determining the direction and magnitude of the electrical forces of the heart.
westinghouse brake — a railroad air brake operated by compressed air.
wheelchair housing — housing designed or adapted for a chairbound person
whispering gallery — a space or gallery beneath a dome or broad arch in which low sounds produced at any of certain points are clearly audible at certain other distant points.
whitewater rafting — the sport of rafting down fast-flowing rivers, esp over rapids
with flying colors — with flying colors, with an overwhelming victory, triumph, or success: He passed the test with flying colors.
working hypothesis — See under hypothesis (def 1).

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