18-letter words containing a, b, t, g
- radiocarbon dating — the determination of the age of objects of organic origin by measurement of the radioactivity of their carbon content.
- ragtag and bobtail — the riffraff; rabble: The ragtag and bobtail of every nation poured into the frontier in search of gold.
- range of stability — the angle to the perpendicular through which a vessel may be heeled without losing the ability to right itself.
- relational algebra — (database, theory) A family of algebra with a well-founded semantics used for modelling the data stored in relational databases, and defining queries on it. The main operations of the relational algebra are the set operations (such as union, intersection, and cartesian product), selection (keeping only some lines of a table) and the projection (keeping only some columns). The relational data model describes how the data is structured.
- risk based testing — (testing) Testing based on identification of potential risks (or "candidate risks"), which should be analysed by the project stakeholder or which might appear during the project's development.
- saturation bombing — intense area bombing intended to destroy everything in the target area.
- seven-league boots — mythical boots that allowed the wearer to travel seven leagues (a former unit of measurement), ie a great length, at each step
- significant symbol — a verbal or nonverbal gesture, as a word or smile, that has acquired a conventionalized meaning.
- stand-by generator — an electrical system which operates automatically in case the usual system malfunctions
- stand-by passenger — someone who buys a (usually cheaper) ticket, if they are still available, on a plane just before it is about to leave rather than booking in advance
- strangeness number — a quantum number, designating the strangeness of an elementary particle, equivalent to the hypercharge minus the baryon number
- supraorbital ridge — browridge.
- the beautiful game — football
- the general public — the people in a society; people in general
- to be above ground — to be alive
- 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 get a bad press — If someone or something gets a bad press, they are criticized, especially in the newspapers, on television, or on radio. If they get a good press, they are praised.
- transporter bridge — a bridge for carrying passengers and vehicles by means of a platform suspended from a trolley.
- travelling library — a mobile library in which a vehicle such as a van delivers books to be borrowed
- treaty obligations — obligations or duties that must be carried out by a party as according to a treaty they have entered into
- urban homesteading — homesteading (def 2).
- westinghouse brake — a railroad air brake operated by compressed air.
- wingback formation — single wingback formation.
- 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.