18-letter words containing n, d, r, a, g, h
- rhyming dictionary — a specialist dictionary organized by the final sounds of words, used to write poetry
- runge-kutta method — a numerical method, involving successive approximations, used to solve differential equations.
- 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
- 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
- the grand national — an annual steeplechase run at Aintree, Liverpool, since 1839
- 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.
- under the aegis of — guided or protected by
- urban homesteading — homesteading (def 2).