18-letter words containing o, p, e, r
- lenticular process — a method for producing images with a three-dimensional effect by photographing on lenticulated film.
- linear programming — any of several methods for finding where a given linear function of several nonnegative variables assumes an extreme value and for determining the extreme value, the variable usually being subjected to constraints in the form of linear equalities or inequalities.
- lipopolysaccharide — any of a class of polysaccharides to which lipids are attached.
- list comprehension — (functional programming) An expression in a functional language denoting the results of some operation on (selected) elements of one or more lists. An example in Haskell: This returns all pairs of numbers (x,y) where x and y are elements of the list 1, 2, ..., 10, y <= x and their sum is less than 10. A list comprehension is simply "syntactic sugar" for a combination of applications of the functions, concat, map and filter. For instance the above example could be written: The term "list comprehension" appears in the references below. The earliest reference to the notation is in Rod Burstall and John Darlington's description of their language, NPL. David Turner subsequently adopted this notation in his languages SASL, KRC and Miranda, where he has called them "ZF expressions", set abstractions and list abstractions (in his 1985 FPCA paper [Miranda: A Non-Strict Functional Language with Polymorphic Types]).
- lone-parent family — a family in which there is only one parent
- louisiana purchase — a treaty signed with France in 1803 by which the U.S. purchased for $15,000,000 the land extending from the Mississippi River to the Rocky Mountains and from Canada to the Gulf of Mexico.
- low blood pressure — hypotension.
- lower palaeolithic — the earliest of the three sections of the Palaeolithic, beginning about 3 million years ago and ending about 70 000 bc with the emergence of Neanderthal man
- lubber grasshopper — plains grasshopper.
- lyophilized powder — Lyophilized powder is a freeze-dried powder.
- macro preprocessor — preprocessor
- magnesium peroxide — a white, tasteless, water-insoluble powder, MgO 2 , used as an antiseptic and as an oxidizing and bleaching agent.
- make a practice of — be in the habit of
- make an impression — have impact
- maritime provinces — region in Canada
- market opportunity — a situation in which a company can meet an unsatisfied customer need before its competitors
- maternity hospital — birthing facility
- may flower compact — an agreement to establish a government, entered into by the Pilgrims in the cabin of the Mayflower on November 11, 1620.
- means of transport — vehicle or system of travel
- medical profession — the body of people who work as doctors of medicine
- membrane transport — the process by which physiologically important substances, such as calcium ions, sugars, etc, are conveyed across a biological membrane
- mercury-vapor lamp — a lamp producing a light with a high actinic and ultraviolet content by means of an electric arc in mercury vapor.
- mergui archipelago — a group of over 200 islands in the Andaman Sea, off the Tenasserim coast of S Myanmar: mountainous and forested
- metamorphic facies — Geology. a group of metamorphic rock units characterized by particular mineralogic associations.
- methylprednisolone — A synthetic glucocorticoid drug, with chemical formula C22H30O5.
- mezzo-soprano clef — a C clef locating middle C on the line next to the lowest line of the staff.
- microencapsulation — the process of enclosing chemical substances in microcapsules.
- micrometer caliper — calipers with a micrometer screw, for extremely accurate measurement
- micrometer-caliper — any of various devices for measuring minute distances, angles, etc., as in connection with a telescope or microscope.
- micropalaeontology — the branch of palaeontology concerned with the study of microscopic fossils
- microwave spectrum — a spectrum of electromagnetic radiations whose wavelengths fall in the microwave range.
- midstream operator — A midstream operator is a company that gathers, transports, and processes natural gas or oil.
- military policeman — A military policeman is a member of the military police.
- minority president — (in the US) a president who has been elected by the largest number of votes cast but not by a majority of the electorate
- minority programme — a programme that appeals to a minority of the available audience
- misinterpretations — Plural form of misinterpretation.
- misplaced modifier — Grammar. a word, phrase, or clause that seems to refer to or modify an unintended word because of its placement in a sentence, as when young in When young, circuses appeal to all of us.
- misrepresentations — Plural form of misrepresentation.
- moccasin telegraph — the transmission of rumour or secret information; the grapevine
- molecular spectrum — the spectrum of light emitted or absorbed by a species of molecule.
- money for old rope — If you describe a payment as money for old rope, you are emphasizing that it is earned very easily, for very little effort.
- monk's pepper tree — a shrub or small tree, Vitex agnus-castus, of southern Europe, having aromatic, hairy leaves and long clusters of fragrant, pale lilac-blue flowers.
- monochlorobiphenyl — (organic compound) Either of three isomers of a chlorinated derivative of biphenyl containing one chlorine atom.
- monographic series — a series of monographs issued in uniform style or format and related by subject or by issuing agency.
- monophosphorylated — (biochemistry) phosphorylated with a single unit of phosphoric acid.
- mop the floor with — that part of a room, hallway, or the like, that forms its lower enclosing surface and upon which one walks.
- mordovian republic — a constituent republic of W central Russia, in the middle Volga basin. Capital: Saransk. Pop: 888 700 (2002). Area: 26 200 sq km (10 110 sq miles)
- morning-after pill — a contraceptive pill containing only an estrogen and used by women within a few hours after sexual intercourse.
- morphine addiction — the fact or condition of being addicted to morphine
- mosquito repellent — a chemical substance, such as a spray or lotion, applied to the body to prevent mosquitoes biting