| hemispherical | (adjective) of or relating to or being a hemisphere | - |
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| hexachlorophene | (noun) antibacterial substance that is a water-soluble powder used in antiseptic soaps and toothpaste | - |
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| historiographer | (noun) a person who is an authority on history and who studies it and writes about it | Synonyms: historian |
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| hydrosphere | (noun) the watery layer of the earth's surface; includes water vapor | - |
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| hyphema | (noun) bleeding into the interior chamber of the eye | - |
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| hyphen | (noun) a punctuation mark (-) used between parts of a compound word or between the syllables of a word when the word is divided at the end of a line of text | Synonyms: dash |
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| (verb) divide or connect with a hyphen | Synonyms: hyphenate |
| hyphenate | (verb) divide or connect with a hyphen | Synonyms: hyphen |
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| hyphenation | (noun) connecting syllables and words by hyphens | - |
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| (noun) division of a word especially at the end of a line on a page | Synonyms: word division |
| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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| (adjective) impossible to determine the meaning of | - |
| ionosphere | (noun) the outer region of the Earth's atmosphere; contains a high concentration of free electrons | - |
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| isophene | (noun) a line indicating biological events occurring with coincidence such as plants flowering. | - |
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| lexicographer | (noun) a compiler or writer of a dictionary; a student of the lexical component of language | Synonyms: lexicologist |
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| lithographer | (noun) a printmaker who uses lithography | - |
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| lithosphere | (noun) the solid part of the earth consisting of the crust and outer mantle | Synonyms: geosphere |
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| lymphedema | (noun) swelling (usually in the legs) caused by lymph accumulating in the tissues in the affected areas | - |
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| magnetosphere | (noun) the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field | - |
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| mephenytoin | (noun) a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective | Synonyms: Mesantoin |
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| mephistophelean | (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, diabolical, mephistophelian |
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| mephistophelian | (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, diabolical, mephistophelean |
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| mesosphere | (noun) the atmospheric layer between the stratosphere and the thermosphere | - |
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| methamphetamine | (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chalk, chicken feed, crank, deoxyephedrine, glass, ice, meth, methamphetamine hydrochloride, Methedrine, shabu, trash |
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| methylenedioxymethamphetamine | (noun) a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States | Synonyms: MDMA |
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| methylphenidate | (noun) central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children | Synonyms: Ritalin |
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| monomorphemic | (adjective) consisting of only one morpheme | - |
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| morphea | (noun) localized scleroderma | - |
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| morpheme | (noun) minimal meaningful language unit; it cannot be divided into smaller meaningful units | - |
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| morphemic | (adjective) of or relating to morphemes | - |
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| nepheline | (noun) a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels | Synonyms: nephelite |
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| nephelinite | (noun) an igneous rock consisting of nepheline and pyroxene | - |
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| nephelite | (noun) a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels | Synonyms: nepheline |
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| nephew | (noun) a son of your brother or sister | - |
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| nonspherical | (adjective) not spherical | - |
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| nymphet | (noun) a sexually attractive young woman | - |
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| oceanographer | (noun) a scientist who studies physical and biological aspects of the seas | - |
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| ommastrephes | (noun) extremely active cylindrical squid with short strong arms and large rhombic terminal fins | - |
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| oosphere | (noun) a gamete; used especially of lower plants | - |
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| orphenadrine | (noun) a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism | Synonyms: Norflex |
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| oxyphenbutazone | (noun) an anti-inflammatory drug (trade name Tandearil) used to treat arthritis and bursitis | Synonyms: Tandearil |
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| oxyphencyclimine | (noun) an anticholinergic drug (trade name Daricon) used in treating peptic ulcers | Synonyms: Daricon |
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| ozonosphere | (noun) a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun | Synonyms: ozone layer |
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| paleographer | (noun) an archeologist skilled in paleography | Synonyms: paleographist |
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| paragrapher | (noun) a writer of paragraphs (as for publication on the editorial page of a newspaper) | - |
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| paraphernalia | (noun) equipment consisting of miscellaneous articles needed for a particular operation or sport etc. | Synonyms: appurtenance, gear |
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| peripheral | (adjective) on or near an edge or constituting an outer boundary; the outer area | - |
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| (adjective) related to the key issue but not of central importance | - |
| (noun) electronic equipment external to the circuit board that contains the CPU of a computer | Synonyms: computer peripheral, peripheral device |
| peripherally | (adverb) in or at or near a periphery or according to a peripheral role or function or relationship | - |
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| periphery | (noun) the outside boundary or surface of something | Synonyms: fringe, outer boundary |
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| perphenazine | (noun) tranquilizer and antidepressant (trade name Triavil) sometimes used as an antiemetic for adults | Synonyms: Triavil |
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| pheasant | (noun) large long-tailed gallinaceous bird native to the Old World but introduced elsewhere | - |
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| (noun) flesh of a pheasant; usually braised | - |
| phellem | (noun) (botany) outer tissue of bark; a protective layer of dead cells | Synonyms: cork |
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| phenacetin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, acetphenetidin |
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| phenacomys | (noun) any of several vole-like terrestrial or arboreal rodents of cold forested regions of Canada and western United States | - |
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| phenazopyridine | (noun) analgesic (trade name Pyridium) used to treat urinary tract infections | Synonyms: Pyridium |
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| phencyclidine | (noun) a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen | Synonyms: angel dust, PCP, phencyclidine hydrochloride |
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| phenelzine | (noun) monoamine oxidase inhibitor (trade name Nardil) used to treat clinical depression | Synonyms: Nardil |
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| pheniramine | (noun) an antihistamine used in preparations to treat allergies and respiratory infections; used to treat rhinitis and skin rashes and pruritus | - |
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| phenobarbital | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbitone, purple heart, sodium thiopental |
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| phenobarbitone | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbital, purple heart, sodium thiopental |
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| phenol | (noun) any of a class of weakly acidic organic compounds; molecule contains one or more hydroxyl groups | - |
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| (noun) a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally | Synonyms: carbolic acid, hydroxybenzene, oxybenzene, phenylic acid |
| phenolic | (noun) a thermosetting resin | Synonyms: phenolic resin, phenoplast |
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| phenolphthalein | (noun) a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8 | - |
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| phenomenal | (adjective) of or relating to a phenomenon | - |
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| (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, marvelous, rattling, terrific, tremendous, wonderful, wondrous |
| phenomenality | (noun) The state or property of being very remarkable; highly extraordinary; amazing. | - |
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| phenomenally | (adverb) to a phenomenal degree | - |
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| phenomenology | (noun) a philosophical doctrine proposed by Edmund Husserl based on the study of human experience in which considerations of objective reality are not taken into account | - |
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| phenomenon | (noun) any state or process known through the senses rather than by intuition or reasoning | - |
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| (noun) a remarkable development | - |
| phenoplast | (noun) a thermosetting resin | Synonyms: phenolic, phenolic resin |
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| phenothiazine | (noun) a compound used primarily in veterinary medicine to rid farm animals of internal parasites | Synonyms: thiodiphenylamine |
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| phenotype | (noun) what an organism looks like as a consequence of the interaction of its genotype and the environment | - |
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| phenotypic | (adjective) of or relating to or constituting a phenotype | Synonyms: phenotypical |
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| phenotypical | (adjective) of or relating to or constituting a phenotype | Synonyms: phenotypic |
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| phensuximide | (noun) anticonvulsant (trade name Milontin) used to treat petit mal | Synonyms: Milontin |
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| phentolamine | (noun) a virility drug (trade name Vasomax) to treat erectile dysfunction in men | Synonyms: Vasomax |
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| phenylacetamide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, acetanilide |
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| phenylalanine | (noun) an essential amino acid found in proteins and needed for growth of children and for protein metabolism in children and adults; abundant in milk and eggs; it is normally converted to tyrosine in the human body | - |
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| phenylamine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aminobenzine, aniline, aniline oil |
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| phenylbutazone | (noun) anti-inflammatory drug (trade name Butazolidin) | Synonyms: Butazolidin |
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| phenylephrine | (noun) a powerful vasoconstrictor used to dilate the pupils and relieve nasal congestion | - |
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| phenylethylene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, styrene, vinylbenzene |
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| phenylketonuria | (noun) a genetic disorder of metabolism; lack of the enzyme needed to turn phenylalanine into tyrosine results in an accumulation of phenylalanine in the body fluids which causes various degrees of mental deficiency | Synonyms: PKU |
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| phenylpropanolamine | (noun) an adrenergic drug used in many preparations to relieve allergic reactions or respiratory infections | - |
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| phenyltoloxamine | (noun) antihistamine included in some preparations used to treat coughing and nasal congestion | - |
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| phenytoin | (noun) an anticonvulsant drug (trade name Dilantin) used to treat epilepsy and that is not a sedative | Synonyms: Dilantin, diphenylhydantoin |
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| pheochromocytoma | (noun) a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension | Synonyms: phaeochromocytoma |
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| pheresis | (noun) a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion | Synonyms: apheresis |
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| pheromone | (noun) a chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species | - |
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| philosopher | (noun) a specialist in philosophy | - |
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| (noun) a wise person who is calm and rational; someone who lives a life of reason with equanimity | - |
| photographer | (noun) someone who takes photographs professionally | Synonyms: lensman |
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| photosphere | (noun) the intensely luminous surface of a star (especially the sun) | - |
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| plasmapheresis | (noun) plasma is separated from whole blood and the rest is returned to the donor | - |
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| plateletpheresis | (noun) platelets are separated from whole blood and the rest is returned to the donor | - |
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| polymorphemic | (adjective) consisting of two or more morphemes | - |
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| pornographer | (noun) someone who presents shows or sells writing or pictures that are sexually explicit in violation of the community mores | Synonyms: porn merchant |
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| prophecy | (noun) knowledge of the future (usually said to be obtained from a divine source) | Synonyms: prognostication, vaticination |
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| (noun) a prediction uttered under divine inspiration | Synonyms: divination |
| prophesier | (noun) an authoritative person who divines the future | Synonyms: oracle, prophet, seer, vaticinator |
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| prophesy | (verb) predict or reveal through, or as if through, divine inspiration | Synonyms: vaticinate |
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| (verb) deliver a sermon | Synonyms: preach |
| prophet | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, seer, vaticinator |
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| (noun) someone who speaks by divine inspiration; someone who is an interpreter of the will of God | - |
| prophetess | (noun) a woman prophet | - |
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| prophetic | (adjective) foretelling events as if by supernatural intervention | Synonyms: prophetical |
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| prophetical | (adjective) foretelling events as if by supernatural intervention | Synonyms: prophetic |
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| prophetically | (adverb) in a prophetic manner | - |
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