| interphone | (noun) a telephonic intercommunication system linking different rooms in a building or ship etc | - |
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| ionophoresis | (noun) the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode | Synonyms: cataphoresis, dielectrolysis, electrophoresis |
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| iontophoresis | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontotherapy |
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| isophone | (noun) linguistics, an isogloss marking off an area in which a particular feature of pronunciation is found. | - |
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| kniphofia | (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, flameflower, tritoma |
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| kyphosis | (noun) The property of having an abnormal convex curvature in the cervical or lumbar regions of the spine. | - |
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| (noun) an abnormal backward curve to the vertebral column | Synonyms: humpback, hunchback |
| lagerphone | (noun) an Australian percussion instrument used for playing bush music; a long stick with bottle caps nailed loosely to it; played by hitting it with a stick or banging it on the ground | - |
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| lamphouse | (noun) housing that holds a lamp (as in a movie projector) | Synonyms: lamp house, lamp housing |
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| lepidophobia | (noun) a morbid fear of snakes | - |
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| loophole | (noun) a small hole in a fortified wall; for observation or discharging weapons | - |
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| (noun) an ambiguity (especially one in the text of a law or contract) that makes it possible to evade a difficulty or obligation | - |
| lymphoblast | (noun) an immature lymphocyte | - |
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| lymphocyte | (noun) an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection | Synonyms: lymph cell |
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| lymphocytopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphopenia |
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| lymphocytosis | (noun) an abnormal increase in the number of lymphocytes in the circulating blood | - |
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| lymphogranuloma | (noun) swelling of a lymph node | - |
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| lymphography | (noun) roentgenographic examination of lymph nodes and lymph vessels after injection of a radiopaque contrast medium; produces a lymphangiogram | Synonyms: lymphangiography |
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| lymphokine | (noun) a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages) | - |
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| lymphoma | (noun) a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer | - |
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| lymphopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphocytopenia |
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| lymphopoiesis | (noun) the formation of lymphocytes in the bone marrow and lymph nodes and thymus and spleen | - |
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| mastigophoran | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophore |
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| mastigophore | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophoran |
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| megaphone | (noun) a cone-shaped acoustic device held to the mouth to intensify and direct the human voice | - |
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| membranophone | (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: drum, tympan |
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| mephobarbital | (noun) a long-acting crystalline barbiturate (trade name Mebaral) used as a sedative and as an anticonvulsant in the treatment of epilepsy | Synonyms: Mebaral |
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| metamorphopsia | (noun) a defect of vision in which objects appear to be distorted; usually due to a defect in the retina | - |
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| metamorphosis | (noun) a complete change of physical form or substance especially as by magic or witchcraft | - |
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| (noun) a striking change in appearance or character or circumstances | Synonyms: transfiguration |
| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metabolism |
| metaphor | (noun) a figure of speech in which an expression is used to refer to something that it does not literally denote in order to suggest a similarity | - |
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| microphone | (noun) device for converting sound waves into electrical energy | Synonyms: mic, mike |
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| microphoning | (noun) the transduction of sound waves into electrical waves (by a microphone) | - |
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| microphotometer | (noun) special kind of densitometer that measures density variations over a very small area | - |
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| monophony | (noun) music consisting of a single vocal part (usually with accompaniment) | Synonyms: monody, monophonic music |
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| morphogenesis | (noun) differentiation and growth of the structure of an organism (or a part of an organism) | - |
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| morphology | (noun) the branch of biology that deals with the structure of animals and plants | - |
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| (noun) studies of the rules for forming admissible words | - |
| (noun) the admissible arrangement of sounds in words | Synonyms: sound structure, syllable structure, word structure |
| (noun) the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms | Synonyms: geomorphology |
| morphophoneme | (noun) (linguistics) the phonemes (or strings of phonemes) that constitute the various allomorphs of a morpheme | - |
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| morphophonemics | (noun) the study of the phonological realization of the allomorphs of the morphemes of a language | - |
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| morphophysiology | (noun) the study of anatomy in its relation to function | Synonyms: functional anatomy, physiological anatomy |
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| musophobia | (noun) a morbid fear of mice | - |
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| mysophobia | (noun) a morbid fear of dirt or contamination | - |
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| neophobia | (noun) a morbid fear of novelty | - |
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| nephology | (noun) the branch of meteorology that studies clouds and cloud formation | - |
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| nephoscope | (noun) a measuring instrument that uses a grid for measuring the altitude, direction, and velocity of movement of clouds | - |
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| nyctophobia | (noun) a morbid fear of night or darkness | - |
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| nympho | (noun) a woman with abnormal sexual desires | Synonyms: nymphomaniac |
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| nympholepsy | (noun) a frenzy of emotion; as for something unattainable | - |
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| nympholept | (noun) a person seized by nympholepsy | - |
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| nymphomania | (noun) abnormally intense sexual desire in women | - |
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| nymphomaniac | (noun) a woman with abnormal sexual desires | Synonyms: nympho |
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| onychophoran | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: peripatus, velvet worm |
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| oophorectomy | (noun) surgical removal of one or both ovaries | Synonyms: ovariectomy |
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| oophoritis | (noun) inflammation of one or both ovaries | - |
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| oophorosalpingectomy | (noun) surgical removal of one or both ovaries and the corresponding Fallopian tubes | - |
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| organophosphate | (noun) an insecticide that interferes with an insect's nervous system | - |
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| orthophosphate | (noun) a salt of phosphoric acid | Synonyms: inorganic phosphate, phosphate |
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| paratyphoid | (noun) any of a variety of infectious intestinal diseases resembling typhoid fever | Synonyms: paratyphoid fever |
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| peephole | (noun) a hole (in a door or an oven etc) through which you can peep | Synonyms: eyehole, spyhole |
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| phobia | (noun) an anxiety disorder characterized by extreme and irrational fear of simple things or social situations | Synonyms: phobic disorder, phobic neurosis |
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| phobophobia | (noun) a morbid fear of developing a phobia | - |
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| phocomelia | (noun) an abnormality of development in which the upper part of an arm or leg is missing so the hands or feet are attached to the body like stumps; rare condition that results from taking thalidomide during pregnancy | Synonyms: seal limbs |
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| phoebe | (noun) small dun-colored North American flycatcher | Synonyms: phoebe bird, Sayornis phoebe |
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| phoenicophorium | (noun) latanier palm | Synonyms: genus Phoenicophorium |
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| phoenix | (noun) a legendary Arabian bird said to periodically burn itself to death and emerge from the ashes as a new phoenix; according to most versions only one phoenix lived at a time and it renewed itself every 500 years | - |
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| (noun) a large monocotyledonous genus of pinnate-leaved palms found in Asia and Africa | Synonyms: genus Phoenix |
| phon | (noun) a unit of subjective loudness | - |
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| phonation | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: vocalisation, vocalism, vocalization, voice, vox |
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| phone | (noun) electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds | Synonyms: telephone, telephone set |
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| (noun) electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear | Synonyms: earphone, earpiece, headphone |
| (noun) (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language | Synonyms: sound, speech sound |
| phonebook | (noun) a directory containing an alphabetical list of telephone subscribers and their telephone numbers | Synonyms: phone book, telephone book, telephone directory |
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| phoneme | (noun) (linguistics) one of a small set of speech sounds that are distinguished by the speakers of a particular language | - |
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| phonemics | (noun) the study of the sound system of a given language and the analysis and classification of its phonemes | Synonyms: phonology |
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| phoner | (noun) the person initiating a telephone call | Synonyms: caller-up, caller, telephoner |
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| phonetician | (noun) a specialist in phonetics | - |
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| phonetics | (noun) the branch of acoustics concerned with speech processes including its production and perception and acoustic analysis | - |
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| phoney | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissembler, dissimulator, hypocrite, phony, pretender |
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| phonics | (noun) teaching reading by training beginners to associate letters with their sound values | - |
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| phonogram | (noun) any written symbol standing for a sound or syllable or morpheme or word | - |
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| phonograph | (noun) machine in which rotating records cause a stylus to vibrate and the vibrations are amplified acoustically or electronically | Synonyms: record player |
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| phonologist | (noun) a specialist in phonology | - |
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| phonology | (noun) the study of the sound system of a given language and the analysis and classification of its phonemes | Synonyms: phonemics |
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| phonophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: acousticophobia |
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| phony | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissembler, dissimulator, hypocrite, phoney, pretender |
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| phoronid | (noun) hermaphrodite wormlike animal living in mud of the sea bottom | - |
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| phosgene | (noun) a colorless poisonous gas that smells like new-mown hay; used in chemical warfare | - |
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| phosphatase | (noun) any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates | - |
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| phosphate | (noun) carbonated drink with fruit syrup and a little phosphoric acid | - |
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| (noun) a salt of phosphoric acid | Synonyms: inorganic phosphate, orthophosphate |
| phosphine | (noun) a colorless gas with a strong fishy smell; used as a pesticide | - |
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| phosphocreatine | (noun) an organic compound of creatine and phosphoric acid; found in the muscles of vertebrates where its hydrolysis releases energy for muscular contraction | Synonyms: creatine phosphate, creatine phosphoric acid |
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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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| phosphoprotein | (noun) containing chemically bound phosphoric acid | - |
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| phosphor | (noun) a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes | - |
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| phosphorescence | (noun) a fluorescence that persists after the bombarding radiation has ceased | - |
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| phosphorus | (noun) a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms | Synonyms: atomic number 15, P |
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| phot | (noun) a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux | - |
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| photalgia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photophobia |
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| photo | (noun) a representation of a person or scene in the form of a print or transparent slide or in digital format | Synonyms: exposure, photograph, pic, picture |
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| photocathode | (noun) a cathode that emits electrons when illuminated | - |
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| photocell | (noun) a transducer used to detect and measure light and other radiations | Synonyms: electric eye, magic eye, photoconductive cell, photoelectric cell |
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| photochemistry | (noun) branch of chemistry that deals with the chemical action of light | - |
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| photocoagulation | (noun) surgical procedure that uses an intense laser beam to destroy diseased retinal tissue or to make a scar that will hold the retina in cases of detached retina | - |
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| photocoagulator | (noun) surgical instrument containing a laser for use in photocoagulation | - |
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| photoconduction | (noun) change in the electrical conductivity of a substance as a result of absorbing electromagnetic radiation | Synonyms: photoconductivity |
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| photoconductivity | (noun) change in the electrical conductivity of a substance as a result of absorbing electromagnetic radiation | Synonyms: photoconduction |
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