20-letter words containing l, f, r

lafayette escadrille — a contingent of American aviators who in 1916 served as volunteers (Escadrille Américaine) in the French air force and in 1918 became the 103rd Pursuit Squadron of the U.S. Army.
law of contradiction — the law that a proposition cannot be both true and false or that a thing cannot both have and not have a given property.
law of large numbers — the theorem in probability theory that the number of successes increases as the number of experiments increases and approximates the probability times the number of experiments for a large number of experiments.
law of superposition — Geology. a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.
liberty of the press — freedom of the press.
life-support machine — A life-support machine is the equipment that is used to keep a person alive when they are very ill and cannot breathe without help.
like a house on fire — If two people get on like a house on fire, they quickly become close friends, for example because they have many interests in common.
like a ton of bricks — (used esp of the manner of punishing or reprimanding someone) with great force; severely
liquidity preference — (in Keynesian economics) the degree of individual preference for cash over less liquid assets.
liturgy of the hours — a revision (promulgated in 1970) of the arrangement and texts of the Divine Office
llanfairpwllgwyngyll — a village in NW Wales, in SE Anglesey: reputed to be the longest place name in Great Britain when unabbreviated; means: St Mary's Church in the hollow of the white hazel near the rapid whirlpool of Llandysilio of the red cave
llywelyn ap gruffudd — died 1282, prince of Wales (1258–82): the only Welsh ruler to be recognized as such by the English
logarithmic function — a function defined by y = log bx, especially when the base, b, is equal to e, the base of natural logarithms.
longitudinal framing — a system for framing steel vessels in which light, closely spaced, longitudinal frames are connected by heavy, widely spaced transverse frames with deep webs.
look before you leap — be aware of the risks involved in sth
lost property office — room for mislaid objects
lower yosemite falls — a section of Yosemite Falls in central California, in the Yosemite National Park, that is 98 m (320 ft) high
loyal order of moose — See under moose (def 2).
make head or tail of — to attempt to understand (a problem, etc)
margaret of scotland — Saint. 1045–93, queen consort of Malcolm III of Scotland. Her piety and benefactions to the church led to her canonization (1250). Feast days: June 10, Nov 16
marquis de lafayette — Marie Joseph Paul Yves Roch Gilbert du Motier [ma-ree zhaw-zef pawl eev rawk zheel-ber dy maw-tyey] /maˈri ʒɔˈzɛf pɔl iv rɔk ʒilˈbɛr dü mɔˈtyeɪ/ (Show IPA), Marquis de. Also, La Fayette. 1757–1834, French soldier, statesman, and liberal leader, who served in the American Revolutionary Army as aide-de-camp to General Washington, and took a leading part in the French revolutions of 1789 and 1830.
master of the revels — an English court official from the late 15th to early 18th centuries responsible to the Lord Chamberlain for overseeing and paying for court entertainments.
member of parliament — A Member of Parliament is a person who has been elected by the people in a particular area to represent them in a country's parliament. The abbreviation MP is often used.
member of the public — a member of the general population
methyl chloroformate — a colorless liquid, C 2 H 3 ClO 2 , used chiefly in organic synthesis.
microsoft sql server — (database) A relational database management system (RDBMS) which is part of Microsoft's BackOffice family of servers. SQL Server was designed for client/server use and is accessed by applications using SQL. It runs on Windows NT version 3.5 or higher and is compliant with the ANSI SQL-92 and FIPS 127-2 SQL standards. SQL Server supports symmetric multiprocessing hardware; SNMP, ODBC, and major open standard communications protocols. It has Internet integration, data replication, and data warehousing features. Microsoft SQL Server was originally developed by Sybase Corporation but the cooperation was broken sometime [when?] before version 6.0.
mitral insufficiency — abnormal closure of the mitral valve resulting in regurgitation of blood into the atrium and leading to reduced heart function or heart failure.
morning glory family — the plant family Convulvulaceae, characterized by twining herbaceous vines, shrubs, and trees having alternate, simple, or compound leaves, funnel-shaped, often showy flowers, and fruit in the form of a berry or capsule, and including bindweed, dodder, moonflower, morning glory, and sweet potato.
most general unifier — (logic) If U is the most general unifier of a set of expressions then any other unifier, V, can be expressed as V = UW, where W is another substitution. See also unification.
mother of the chapel — (in British trade unions in the publishing and printing industries) a woman shop steward
mother-of-pearl moth — a pyralid moth, Pleuroptya ruralis, having a pale sheen, that is often seen around nettles, on which its green larvae feed
naturalistic fallacy — the supposed fallacy of inferring evaluative conclusions from purely factual premises
new zealand fur seal — an Australasian seal, Arctocephalus forsteri
normal magnification — the magnification produced by a telescope or microscope such that the diameter of the exit pupil of the instrument is equal to the diameter of the pupil of the eye.
normal zeeman effect — the dividing of a spectral line or lines as a result of placing a radiation source in a magnetic field. The division consists of three equally spaced lines (normal Zeeman effect) in systems for which the spin quantum number is zero, or of three or more unequally spaced lines (anomalous Zeeman effect) in systems for which the spin quantum number is not zero.
north atlantic drift — an ocean current flowing NE toward the British Isles, formed by the convergence of the Gulf Stream and the Labrador Current SE of Newfoundland.
northern leaf blight — a disease of corn caused by the fungus Exsherohilum turcicum, characterized by elongate tan-gray elliptical spots with subsequent blighting and necrosis of leaves.
official secrets act — law: legislation protecting state secret
olfactory anesthesia — absence or loss of the sense of smell.
on the factory floor — in a factory; as a factory worker
order bill of lading — a bill of lading that is issued to the order of a shipper or consignee for delivery of the goods and that can be transferred by endorsement to third parties.
order of the thistle — an ancient Scottish order of knighthood revived by James VII of Scotland in 1687. It consists of the sovereign, 16 knights brethren, and extra members created by statute. It is the equivalent of the Order of the Garter, and is usually conferred on Scots
ousterhout's fallacy — Ousterhout's dichotomy
paper qualifications — qualifications gained through official examinations, etc, rather than through experience
pappus of alexandria — 3rd century bc, Greek mathematician, whose eight-volume Synagoge is a valuable source of information about Greek mathematics
parallel of altitude — almucantar.
parallel of latitude — parallel (def 9).
parametric amplifier — a device, as an electron tube or transistor, that amplifies a high-frequency input signal by sinusoidally varying the reactance of the circuit.
partial differential — an expression obtained from a given function of several variables by taking the partial derivative with respect to one of the variables and multiplying by the increment in that variable.
particulars of claim — (in England) the first reading made by the claimant in a county court action, showing the facts upon which he or she relies in support of a claim and the relief asked for

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