18-letter words containing a, h, i, g
- 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
- 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.
- stinking chamomile — mayweed.
- 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.
- swedish gymnastics — a system of passive and active exercising of muscles and joints
- 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.
- teaching assistant — a graduate student in a college or university who is the recipient of a teaching fellowship. Abbreviation: TA.
- teaching equipment — teaching aids
- technical sergeant — a noncommissioned officer ranking below a master sergeant and above a staff sergeant.
- the beautiful game — football
- the damage is done — If you say 'the damage is done', you mean that it is too late now to prevent the harmful effects of something that has already happened.
- 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 intelligentsia — the educated or intellectual people in a society or community
- the magnolia state — a nickname referring to Mississippi
- 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 middle passage — the journey across the Atlantic Ocean from the W coast of Africa to the Caribbean: the longest part of the journey of the slave ships sailing to the Caribbean or the Americas
- 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.
- 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
- three-day eventing — participation in a three day equestrian competition consisting of dressage, cross-country jumping, and stadium jumping
- to a grinding halt — If you describe a bad situation as grinding, you mean it never gets better, changes, or ends.
- 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.
- touch-in-goal line — either of the two touchlines at each end of the field between the goal line and the dead-ball line.
- under the aegis of — guided or protected by
- urban homesteading — homesteading (def 2).
- vectorcardiography — a method of determining the direction and magnitude of the electrical forces of the heart.
- watchdog committee — a committee responsible for monitoring standards of behaviour
- 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
- without obligation — In advertisements, if a product or a service is available without obligation, you do not have to pay for that product or service until you have tried it and are satisfied with it.