13-letter words containing t, o, r, s
- formal system — an uninterpreted symbolic system whose syntax is precisely defined, and on which a relation of deducibility is defined in purely syntactic terms; a logistic system
- formalisation — Alternative spelling of formalization.
- formularistic — relating to formularization
- fort donelson — Fort Donelson.
- fort duquesne — Abraham [a-bra-am] /a braˈam/ (Show IPA), 1610–88, French naval commander.
- fort sheridan — a military reservation in NE Illinois, on W shore of Lake Michigan S of Lake Forest.
- fortississimo — (music) The musical notation indicating that the piece is played louder than fortissimo.
- fortitudinous — having or showing fortitude; marked by bravery or courage.
- fortnightlies — Plural form of fortnightly.
- fortunateness — The quality of being fortunate; fortune; luck.
- forty-seventh — next after the forty-sixth; being the ordinal number for 47.
- foster father — a man who takes the place of a father in raising a child.
- foster mother — a woman who takes the place of a mother in raising a child.
- foster parent — a foster father or foster mother.
- foster sister — a girl brought up with another child of different parents.
- four-way stop — an intersection of two roads with four stop signs, one facing in each direction
- fourth estate — the journalistic profession or its members; the press.
- fowler's toad — an eastern U.S. toad, Bufo woodhousii fowleri, having an almost patternless white belly.
- fractionalise — Alt form fractionalize.
- fractionalism — the state of being separate or inharmonious
- fractionalist — an advocate or supporter of fractionalism
- fractiousness — refractory or unruly: a fractious animal that would not submit to the harness.
- fractocumulus — low ragged slightly bulbous cloud, often appearing below nimbostratus clouds during rain
- fractostratus — low ragged layered cloud often appearing below nimbostratus clouds during rain
- free software — (software) Software that everyone is free to copy, redistribute and modify. That implies free software must be available as source code, hence "free open source software" - "FOSS". It is usually also free of charge, though anyone can sell free software so long as they don't impose any new restrictions on its redistribution or use. The widespread acceptance of this definition and free software itself owes a great deal to Richard Stallman and the Free Software Foundation. There are many other kinds of "free software" in the sense of "free of charge". See "-ware".
- freight house — a depot or storage place for freight.
- frontal gyrus — any of several convolutions on the outer surface of the frontal lobe of the cerebrum.
- frontier post — an official point where people or vehicles cross over a border between countries
- frontispieces — Plural form of frontispiece.
- frontogenesis — the formation or increase of a front or frontal zone.
- frosted glass — etched glass with a translucent surface
- frozen assets — business assets that are not convertible into cash, as by government direction or business conditions
- frozen wastes — vast parts of land covered by snow and ice and usually uninhabited by people
- frumentaceous — of the nature of or resembling wheat or other grain.
- frumentarious — of or relating to wheat or a similar grain
- functionaries — Plural form of functionary.
- gabrilowitsch — Ossip [aw-syip] /ˈɔ syɪp/ (Show IPA), 1878–1936, Russian pianist and conductor, in America.
- galois theory — the branch of mathematics that deals with the application of the theory of finite groups to the solution of algebraic equations.
- galvanometers — Plural form of galvanometer.
- garnetiferous — containing or yielding garnets.
- garrison town — a town containing a military base
- gas separator — A gas separator is a device used to remove liquids from a natural gas stream.
- gas:oil ratio — The gas:oil ratio is the volume of gas produced at standard temperature and pressure, in relation to the volume of oil produced at standard temperature and pressure, used as a measurement for reservoir fluids.
- gastrectomies — Plural form of gastrectomy.
- gastrocnemius — the largest muscle in the calf of the leg, the action of which extends the foot, raises the heel, and assists in bending the knee.
- gastroenteric — Gastrointestinal.
- gastrohepatic — of, relating to, or involving the stomach and the liver.
- gastrokinetic — (pharmacology, of a drug) Serving to increase motility of the gastrointestinal tract.
- gastronomical — the art or science of good eating.
- gastroparesis — (pathology) A condition, often a complication of diabetes, characterised by a delayed emptying of the stomach.