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18-letter words containing f, i, t, y

  • information theory — the mathematical theory concerned with the content, transmission, storage, and retrieval of information, usually in the form of messages or data, and especially by means of computers.
  • informatory double — a double intended to inform one's partner that one has a strong hand and to urge a bid regardless of the strength of his or her hand.
  • infrared astronomy — the study of infrared radiation emitted by celestial objects.
  • interface analysis — (testing)   A software test which checks the interfaces between program elements for consistency and adherence to predefined rules or axioms.
  • invalidity benefit — (formerly, in the British National Insurance scheme) a weekly payment to a person who had been off work through illness for more than six months: replaced by incapacity benefit in 1995
  • joint life annuity — an annuity, the payments of which cease at the death of the first of two or more specified persons.
  • knights of pythias — a fraternal order founded in Washington, D.C., in 1864.
  • lifestyle business — a small business in which the owner is more anxious to pursue interests that reflect his or her lifestyle than to make more than a comfortable living
  • lily of the valley — a plant, Convallaria majalis, having an elongated cluster of small, drooping, bell-shaped, fragrant white flowers.
  • locally finite set — a collection of sets in a topological space in which each point of the space has a neighborhood that intersects a finite number of sets of the collection.
  • lone-parent family — a family in which there is only one parent
  • loosestrife family — the plant family Lythraceae, characterized by herbaceous plants, shrubs, and trees having usually opposite or whorled, simple leaves, clusters of flowers, and fruit in the form of a capsule, and including the crape myrtle, loosestrifes of the genus Lythrum, and the henna shrub.
  • milkweed butterfly — monarch butterfly.
  • money of necessity — temporary coinage, as siege pieces, issued in areas where regular coinage is unavailable: sometimes of unusual materials, as leather or wood.
  • multifunctionality — The condition of being multifunctional.
  • myeloproliferative — (medicine) of or pertaining to the presence of an abnormal proliferation of myelopoietic cells (from bone marrow).
  • nursery facilities — places where young children are looked after
  • officer of the day — an officer who has charge of the guard and prisoners on an assigned day at a military installation. Abbreviation: OD, O.D., O.O.D.
  • offset lithography — offset (def 6).
  • omega-3 fatty acid — a polyunsaturated fatty acid, essential for normal retinal function, that influences various metabolic pathways, resulting in lowered cholesterol and triglyceride levels, inhibited platelet clotting, and reduced inflammatory and immune reactions.
  • overdraft facility — a facility (of a bank or building-society cheque account) that allows a withdrawal of money in excess of the account's credit balance
  • pellitory of spain — a small Mediterranean plant, Anacyclus pyrethrum, the root of which contains an oil formerly used to relieve toothache: family Asteraceae (composites)
  • phase-shift keying — (communications)   (PSK) A digital modulation scheme that conveys data by changing the phase of a carrier wave. The data can either determine the absolute phase relative to the unmodulated carrier or reference signal ("coherent phase-shift keying", CPSK) or the change in phase ("differential phase-shift keying", DPSK). The number of different phases used determines the amount of data that can be transmitted in each cycle. Each cycle can be considered to constitute one "symbol", e.g. with two possible phases, each cycle carries one bit. The more phases that are used, the less tollerant to noise the transmissions becomes. Alternatives to PSK are amplitude-shift keying (ASK) and frequency-shift keying (FSK).
  • portrait of a lady — a novel (1881) by Henry James.
  • product life cycle — the four stages (introduction, growth, maturity, and decline) into one of which the sales of a product fall during its market life
  • protein deficiency — a lack or insuffiency of protein
  • provably difficult — The set or property of problems for which it can be proven that no polynomial-time algorithm exists, only exponential-time algorithms.
  • quality of service — (communications, networking)   (QoS) The performance properties of a network service, possibly including throughput, transit delay, priority. Some protocols allow packets or streams to include QoS requirements.
  • quantum efficiency — the number of electrons released by a photocell per photon of incident radiation of a given energy
  • quarry-tiled floor — a floor covered with square or diamond-shaped unglazed floor tiles
  • radiant efficiency — the ratio of the power emitted by a source of radiation to the power consumed by it
  • radius of gyration — the distance from an axis at which the mass of a body may be assumed to be concentrated and at which the moment of inertia will be equal to the moment of inertia of the actual mass about the axis, equal to the square root of the quotient of the moment of inertia and the mass.
  • raffinate recovery — Raffinate recovery is the use of a substance which is left after a process is complete and the desired substances have been removed.
  • range of stability — the angle to the perpendicular through which a vessel may be heeled without losing the ability to right itself.
  • reflection density — a measure of the extent to which a surface reflects light or other electromagnetic radiation, equal to the logarithm to base ten of the reciprocal of the reflectance
  • refrigerated lorry — a lorry which is chilled in the back as for storing food
  • relative frequency — the ratio of the number of times an event occurs to the number of occasions on which it might occur in the same period.
  • safety regulations — regulations or rules that are put in place to ensure a product, event, etc, is safe and not dangerous
  • safety-deposit box — a lockable metal box or drawer, especially in a bank vault, used for safely storing valuable papers, jewelry, etc.
  • security of tenure — (in Britain) the right of a tenant to continue to occupy a dwelling or site unless the landlord obtains a court order for possession of the property or termination of the tenancy agreement
  • self-contradictory — an act or instance of contradicting oneself or itself.
  • self-deprecatingly — in a self-deprecating manner
  • significant symbol — a verbal or nonverbal gesture, as a word or smile, that has acquired a conventionalized meaning.
  • six-finger country — an isolated area considered as being inhabited by people who practise inbreeding
  • society of friends — a Christian denomination, founded in England c. 1650 by George Fox, that has no formal creed, liturgy, or priesthood and rejects violence in human relations, esp. warfare
  • sodium hyposulfite — sodium thiosulfate.
  • specific viscosity — a measure of the resistance to flow of a fluid, expressed as the ratio of the absolute viscosity of the fluid to that of a reference fluid (usually water in the case of liquids)
  • symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
  • territory of papua — a former territory of Australia, consisting of SE New Guinea and adjacent islands: now part of Papua New Guinea
  • the family compact — the ruling oligarchy in Upper Canada in the early 19th century
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