| lipidaemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipemia, lipidemia, lipoidaemia, lipoidemia |
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| lipide | (noun) an oily organic compound insoluble in water but soluble in organic solvents; essential structural component of living cells (along with proteins and carbohydrates) | Synonyms: lipid, lipoid |
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| lipidemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipemia, lipidaemia, lipoidaemia, lipoidemia |
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| lipidosis | (noun) a disorder of lipid metabolism; abnormal levels of certain fats accumulate in the body | - |
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| looping | (noun) (computer science) executing the same set of instructions a given number of times or until a specified result is obtained | Synonyms: iteration |
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| loxapine | (noun) a tranquilizer (trade name Loxitane) used to treat schizophrenia | Synonyms: Loxitane |
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| lumpiness | (noun) The property of being full of lumps, not being smooth. | - |
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| lupin | (noun) any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers | Synonyms: lupine |
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| lupine | (noun) any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers | Synonyms: lupin |
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| luteotropin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, prolactin |
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| lynchpin | (noun) pin inserted through an axletree to hold a wheel on | Synonyms: linchpin |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, keystone, linchpin, mainstay |
| magpie | (noun) long-tailed black-and-white crow that utters a raucous chattering call | - |
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| (noun) someone who collects things that have been discarded by others | Synonyms: pack rat, scavenger |
| (noun) an obnoxious and foolish and loquacious talker | Synonyms: babbler, chatterbox, chatterer, prater, spouter |
| malapropism | (noun) the unintentional misuse of a word by confusion with one that sounds similar | Synonyms: malaprop |
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| mantelpiece | (noun) shelf that projects from wall above fireplace | Synonyms: chimneypiece, mantel, mantle, mantlepiece |
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| mantispid | (noun) insect that resembles a mantis; larvae are parasites in the nests of spiders and wasps | - |
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| mantlepiece | (noun) shelf that projects from wall above fireplace | Synonyms: chimneypiece, mantel, mantelpiece, mantle |
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| mapinguari | (noun) supposed human-sized sloth-like creature reportedly sighted by Indians in the Amazon rain forest | - |
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| mapping | (noun) (genetics) the process of locating genes on a chromosome | Synonyms: chromosome mapping |
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| (noun) the process of making maps | - |
| (noun) (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function) | Synonyms: function, map, mathematical function, single-valued function |
| marlinespike | (noun) a pointed iron hand tool that is used to separate strands of a rope or cable (as in splicing) | Synonyms: marlingspike, marlinspike |
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| marlingspike | (noun) a pointed iron hand tool that is used to separate strands of a rope or cable (as in splicing) | Synonyms: marlinespike, marlinspike |
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| marlinspike | (noun) a pointed iron hand tool that is used to separate strands of a rope or cable (as in splicing) | Synonyms: marlinespike, marlingspike |
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| marsupial | (noun) mammals of which the females have a pouch (the marsupium) containing the teats where the young are fed and carried | Synonyms: pouched mammal |
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| marsupium | (noun) an external abdominal pouch in most marsupials where newborn offspring are suckled | - |
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| masterpiece | (noun) an outstanding achievement | - |
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| (noun) the most outstanding work of a creative artist or craftsman | Synonyms: chef-d'oeuvre |
| meteortropism | (noun) an effect of climate on biological processes (as the effect on joint pains etc.) | - |
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| metopion | (noun) the craniometric point midway between the frontal eminences of the skull | - |
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| microscopist | (noun) a scientist who specializes in research with the use of microscopes | - |
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| minesweeping | (noun) the activity of detecting and disposing of marine mines | - |
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| misanthropist | (noun) someone who dislikes people in general | Synonyms: misanthrope |
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| mispickel | (noun) a silver-white or grey ore of arsenic | Synonyms: arsenopyrite |
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| monotopism | (noun) origin of a systematic group only once (as by mutation) or at a single location. | - |
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| mopping | (noun) cleaning with a mop | Synonyms: swabbing |
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| mouthpiece | (noun) the aperture of a wind instrument into which the player blows directly | Synonyms: embouchure |
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| (noun) the tube of a pipe or cigarette holder that a smoker holds in the mouth | - |
| (noun) an acoustic device; the part of a telephone into which a person speaks | - |
| (noun) (especially boxing) equipment that protects an athlete's mouth | Synonyms: gumshield |
| (noun) a part that goes over or into the mouth of a person | - |
| (noun) a spokesperson (as a lawyer) | Synonyms: mouth |
| myopia | (noun) (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred | Synonyms: nearsightedness, shortsightedness |
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| neckpiece | (noun) an article of apparel worn about the neck | - |
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| neuroepithelioma | (noun) malignant tumor of the neuroepithelium | - |
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| neuroepithelium | (noun) epithelium associated with special sense organs and containing sensory nerve endings | - |
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| neuropil | (noun) the complex network of unmyelinated axones, dendrites, and glial branches that form the bulk of the central nervous system's grey matter and in which nerve cell bodies are embedded | Synonyms: neuropile |
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| neuropile | (noun) the complex network of unmyelinated axones, dendrites, and glial branches that form the bulk of the central nervous system's grey matter and in which nerve cell bodies are embedded | Synonyms: neuropil |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| nevirapine | (noun) a non-nucleoside reverse transcriptase inhibitor (trade name Viramune) used to treat AIDS and HIV | Synonyms: Viramune |
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| nifedipine | (noun) calcium blocker (trade name Procardia); appears to increase the risk of recurrent heart attacks | Synonyms: Procardia |
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| ninepin | (noun) a bowling pin of the type used in playing ninepins or (in England) skittles | Synonyms: skittle, skittle pin |
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| ninepins | (noun) a bowling game that is played by rolling a bowling ball down a bowling alley at a target of nine wooden pins | Synonyms: skittles |
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| nitpicker | (noun) someone who makes small and unjustified criticisms | - |
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| norepinephrine | (noun) a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses | Synonyms: noradrenaline |
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| nosepiece | (noun) the link between two lenses; rests on the nose | Synonyms: bridge |
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| (noun) armor plate that protects the nose | - |
| (noun) a strap that is the part of a bridle that goes over the animal's nose | Synonyms: noseband |
| nyctalopia | (noun) inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder | Synonyms: moon blindness, night blindness |
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| occupier | (noun) someone who lives at a particular place for a prolonged period or who was born there | Synonyms: occupant, resident |
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| (noun) a member of a military force who is residing in a conquered foreign country | - |
| okapi | (noun) similar to the giraffe but smaller with much shorter neck and stripe on the legs | Synonyms: Okapia johnstoni |
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| oophorosalpingectomy | (noun) surgical removal of one or both ovaries and the corresponding Fallopian tubes | - |
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| opiate | (noun) a narcotic drug that contains opium or an opium derivative | - |
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| opinion | (noun) the reason for a court's judgment (as opposed to the decision itself) | Synonyms: ruling |
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| (noun) a personal belief or judgment that is not founded on proof or certainty | Synonyms: persuasion, sentiment, thought, view |
| (noun) a belief or sentiment shared by most people; the voice of the people | Synonyms: popular opinion, public opinion, vox populi |
| (noun) a vague idea in which some confidence is placed | Synonyms: belief, feeling, impression, notion |
| (noun) the legal document stating the reasons for a judicial decision | Synonyms: judgement, judgment, legal opinion |
| (noun) a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof | Synonyms: view |
| opisthorchiasis | (noun) infestation with flukes obtained from eating raw fish; common in eastern Asia | - |
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| opisthotonos | (noun) severe spasm in which the back arches and the head bends back and heels flex toward the back | - |
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| opium | (noun) an addictive narcotic extracted from seed capsules of the opium poppy | - |
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| orpiment | (noun) a yellow mineral occurring in conjunction with realgar; an ore of arsenic | - |
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| orpin | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpine, Sedum telephium |
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| orpine | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpin, Sedum telephium |
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| orthoepist | (noun) a practitioner of orthoepy (especially one of the 17th or 18th century scholars who proposed to reform English spelling so it would reflect pronunciation more closely) | - |
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| outcropping | (noun) the part of a rock formation that appears above the surface of the surrounding land | Synonyms: outcrop, rock outcrop |
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| overcapitalisation | (noun) (business) too much capitalization (the sale of more stock than the business warrants) | Synonyms: overcapitalization |
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| overcapitalization | (noun) (business) too much capitalization (the sale of more stock than the business warrants) | Synonyms: overcapitalisation |
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| overlapping | (noun) covering with a design in which one element covers a part of another (as with tiles or shingles) | Synonyms: imbrication, lapping |
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| overspill | (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overflow, runoff |
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| (noun) the relocation of people from overcrowded cities; they are accommodated in new houses or apartments in smaller towns | - |
| oxyopia | (noun) unusually acute vision | - |
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| palpitation | (noun) a rapid and irregular heart beat | - |
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| (noun) a shaky motion | Synonyms: quiver, quivering, shakiness, shaking, trembling, vibration |
| panpipe | (noun) a primitive wind instrument consisting of several parallel pipes bound together | Synonyms: pandean pipe, syrinx |
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| papilla | (noun) a small projection of tissue at the base of a hair or tooth or feather | - |
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| (noun) a small nipple-shaped protuberance concerned with taste, touch, or smell | - |
| (noun) (botany) a tiny outgrowth on the surface of a petal or leaf | - |
| papilledema | (noun) swelling of the optic disc (where the optic nerve enters the eyeball); usually associated with an increase in intraocular pressure | - |
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| papilloma | (noun) a benign epithelial tumor forming a rounded mass | Synonyms: papillary tumor, papillary tumour, villoma |
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| papillon | (noun) small slender toy spaniel with erect ears and a black-spotted brown to white coat | - |
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| papism | (noun) offensive terms for the practices and rituals of the Roman Catholic Church | Synonyms: popery |
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| (noun) the beliefs and practices of the Catholic Church based in Rome | Synonyms: Roman Catholicism, Romanism |
| papist | (noun) an offensive term for Roman Catholics; originally, a Roman Catholic who was a strong advocate of the papacy | - |
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| parallelepiped | (noun) a prism whose bases are parallelograms | Synonyms: parallelepipedon, parallelopiped, parallelopipedon |
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| parallelepipedon | (noun) a prism whose bases are parallelograms | Synonyms: parallelepiped, parallelopiped, parallelopipedon |
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| parallelopiped | (noun) a prism whose bases are parallelograms | Synonyms: parallelepiped, parallelepipedon, parallelopipedon |
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| parallelopipedon | (noun) a prism whose bases are parallelograms | Synonyms: parallelepiped, parallelepipedon, parallelopiped |
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| participial | (noun) a non-finite form of the verb; in English it is used adjectivally and to form compound tenses | Synonyms: participle |
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| paypig | (noun) A sexually submissive male | - |
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| peacekeeping | (noun) the activity of keeping the peace by military forces (especially when international military forces enforce a truce between hostile groups or nations) | Synonyms: peacekeeping mission, peacekeeping operation |
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| peppiness | (noun) liveliness and energy | Synonyms: ginger, pep |
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| percipient | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, observer, perceiver |
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| perspicaciousness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: astuteness, perspicacity, shrewdness |
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| perspicacity | (noun) the capacity to assess situations or circumstances shrewdly and to draw sound conclusions | Synonyms: judgement, judgment, sound judgement, sound judgment |
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| (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: astuteness, perspicaciousness, shrewdness |
| perspicuity | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuousness, plainness |
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| perspicuousness | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuity, plainness |
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| perspiration | (noun) salty fluid secreted by sweat glands | Synonyms: sudor, sweat |
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| (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: diaphoresis, hidrosis, sudation, sweating |
| perspirer | (noun) a person who perspires | Synonyms: sweater |
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| philanthropist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: altruist |
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| philippic | (noun) a speech of violent denunciation | Synonyms: broadside, tirade |
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| phlogopite | (noun) a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum | - |
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| phospholipid | (noun) any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes | - |
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| photocopier | (noun) a copier that uses photographic methods of making copies | - |
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| photopigment | (noun) a special pigment found in the rods and cones of the retina | - |
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| phototropism | (noun) an orienting response to light | - |
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| physiotherapist | (noun) therapist who treats injury or dysfunction with exercises and other physical treatments of the disorder | Synonyms: physical therapist |
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| pi | (noun) the 16th letter of the Greek alphabet | - |
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| (noun) the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846... | - |
| pia | (noun) perennial herb of East Indies to Polynesia and Australia; cultivated for its large edible root yielding Otaheite arrowroot starch | Synonyms: Indian arrowroot, Tacca leontopetaloides, Tacca pinnatifida |
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| piaffe | (noun) a cadenced trot executed by the horse in one spot | - |
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