13-letter words containing p, e, n, r
- kitchen paper — also kitchen roll
- klipspringers — Plural form of klipspringer.
- lactoproteins — Plural form of lactoprotein.
- landownership — an owner or proprietor of land.
- laryngoscopes — Plural form of laryngoscope.
- laser pointer — a portable laser that emits monochromatic light over a long and narrow distance, used especially as a pointing device.
- laser printer — Computers. a high-speed printer that uses a laser to form dot-matrix patterns and an electrostatic process to fuse metallic particles to paper a page at a time: capable of producing a variety of character fonts, graphics, and other symbols.
- latent period — Also, latency period. Pathology. the interval between exposure to a carcinogen, toxin, or disease-causing organism and development of a consequent disease.
- leap-frogging — a game in which players take turns in leaping over another player bent over from the waist.
- lepidopterans — Plural form of lepidopteran.
- leprechaunish — somewhat similar to a leprechaun
- lepton number — in a process involving elementary particles, the total number of leptons minus the total number of antileptons.
- letter opener — bladed tool for opening envelopes
- letterspacing — the amount of space between each letter in a word, or the adjustment of this amount of space
- line spectrum — an electromagnetic spectrum consisting of discrete lines, usually characteristic of excited atoms or molecules.
- linkage group — a group of genes in a chromosome that tends to be inherited as a unit.
- little prince — an allegorical fantasy (1943) by Antoine de Saint-Exupéry.
- loebner prize — (artificial intelligence) An annual competition in artificial intelligence started by Dr. Hugh Loebner of New York City in 1991. A $100,000 prize is offered to the author of the first computer program to pass an unrestricted Turing test. Annual competitions are held each year with a $2000 prize for the best program on a restricted Turing test. Sponsors of previous competitions include: Apple Computer, Computerland, Crown Industries, GDE Systems, IBM Personal Computer Company's Center for Natural Computing, Greenwich Capital Markets, Motorola, the National Science Foundation, The Alfred P. Sloan Foundation, and The Weingart Foundation. The 1995 and 1996 events were unrestricted Turing Tests, requiring computer entries to converse indefinitely with no topic restrictions. So far, even the best programs give themselves away almost immediately, either by simple grammatical mistakes or by repetition. Complete transcripts and IBM compatible diskettes that play the 1991, 1992, and 1993 conversations in real-time are available for purchase from the Cambridge Center for Behavioral Studies (telephone: +1 (617) 491 9020, Fax: 1072). Sponsorship opportunities are available.
- lunar eclipse — Astronomy. the obscuration of the light of the moon by the intervention of the earth between it and the sun (lunar eclipse) or the obscuration of the light of the sun by the intervention of the moon between it and a point on the earth (solar eclipse) a similar phenomenon with respect to any other planet and either its satellite or the sun. the partial or complete interception of the light of one component of a binary star by the other.
- macrencephaly — The presence of an abnormally large brain.
- magnetographs — Plural form of magnetograph.
- magnetosphere — the outer region of the earth's ionosphere, where the earth's magnetic field controls the motion of charged particles, as in the Van Allen belts. Compare magnetopause.
- mainz psalter — a book printed by Johannes Gutenberg: thought by some to be the first book printed from movable type.
- major penalty — a penalty consisting of the removal of a player for five minutes from play, no substitute for the player being permitted.
- map reference — information that identifies the point on a map where a particular place is located
- maritime pine — cluster pine.
- marlinespikes — Plural form of marlinespike.
- married print — composite print.
- maternity pay — the pay a woman receives from her work during her absence immediately before and after childbirth
- mean-spirited — petty; small-minded; ungenerous: a meanspirited man, unwilling to forgive.
- measuring cup — a graduated cup used especially in cooking for measuring ingredients.
- megasporangia — a sporangium containing megaspores.
- melbourne cup — an annual horse race run in Melbourne, since 1861
- membranophone — any musical instrument, as a drum, in which the sound is produced by striking, rubbing, or blowing against a membrane stretched over a frame.
- merchant ship — law: commercial vessel
- merleau-ponty — Maurice, 1908–61, French phenomenological philosopher.
- mesne profits — rents or profits accruing during the rightful owner's exclusion from his land
- metanephridia — Plural form of metanephridium.
- metering pump — A metering pump is a device used to pump precise amounts of liquids over a period of time.
- methylparaben — a fine, white, needlelike substance, C 8 H 8 O 3 , used chiefly as a preservative in foods and pharmaceuticals.
- methylpropane — (organic compound) isobutane.
- methylpropene — (organic compound) IUPAC name for isobutylene.
- metropolitans — Plural form of metropolitan.
- mezzo soprano — a voice or voice part intermediate in compass between soprano and contralto.
- mezzo-soprano — a voice or voice part intermediate in compass between soprano and contralto.
- micropayments — Plural form of micropayment.
- microperation — (processor) An elementary operation performed on data stored in registers or in memory. Microperations are classified as transfer, arithmetic, logic, or shift/rotate.
- micropuncture — the puncture of a cell, renal tubule, etc., by a laser beam or micropipette
- midi-pyrénées — a region of SW France: consists of N slopes of the Pyrenees in the south, a fertile lowland area in the west crossed by the River Garonne, and the edge of the Massif Central in the north and east
- mimeographing — Present participle of mimeograph.