| otherness | (noun) the quality of being not alike; being distinct or different from that otherwise experienced or known | Synonyms: distinctness, separateness |
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| otherworld | (noun) an abstract spiritual world beyond earthly reality | - |
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| otherworldliness | (noun) concern with things of the spirit | Synonyms: spiritism, spiritualism, spirituality |
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| othonna | (noun) a South African plant of the genus Othonna having smooth often fleshy leaves and heads of yellow flowers | - |
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| otitis | (noun) inflammation of the ear | - |
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| otoganglion | (noun) an autonomic ganglion whose postganglionic fibers are distributed to the parotid gland | Synonyms: otic ganglion |
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| otolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otorhinolaryngologist, rhinolaryngologist |
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| otolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otorhinolaryngology, rhinolaryngology |
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| otologist | (noun) a physician who specializes in the ear and its diseases | Synonyms: ear doctor, ear specialist |
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| otology | (noun) the branch of medicine concerned with the ear | - |
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| otoplasty | (noun) reconstructive surgery of the auricle of the external ear | - |
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| otorhinolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otolaryngologist, rhinolaryngologist |
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| otorhinolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otolaryngology, rhinolaryngology |
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| otorrhea | (noun) discharge from the external ear | - |
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| otosclerosis | (noun) hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness | - |
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| otoscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, auroscope |
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| ottar | (noun) essential oil or perfume obtained from flowers | Synonyms: atar, athar, attar |
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| otter | (noun) freshwater carnivorous mammal having webbed and clawed feet and dark brown fur | - |
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| (noun) the fur of an otter | - |
| otterhound | (noun) hardy British hound having long pendulous ears and a thick coarse shaggy coat with an oily undercoat; bred for hunting otters | Synonyms: otter hound |
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| ottoman | (noun) thick cushion used as a seat | Synonyms: hassock, pouf, pouffe, puff |
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| (noun) a low seat or a stool to rest the feet of a seated person | Synonyms: footrest, footstool, tuffet |
| overclothes | (noun) clothing for use outdoors | Synonyms: outerwear |
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| overprotection | (noun) excessive protection | Synonyms: momism, overshielding |
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| overshoot | (noun) an approach that fails and gives way to another attempt | Synonyms: go-around, wave-off |
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| ovotestis | (noun) hermaphroditic gonad that contains both testicular and ovarian tissue | - |
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| palaeobotany | (noun) the study of fossil plants | Synonyms: paleobotany |
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| paleobotany | (noun) the study of fossil plants | Synonyms: palaeobotany |
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| pantothen | (noun) a vitamin of the vitamin B complex that performs an important role in the oxidation of fats and carbohydrates and certain amino acids; occurs in many foods | Synonyms: pantothenic acid |
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| papooseroot | (noun) tall herb of eastern North America and Asia having blue berrylike fruit and a thick knotty rootstock formerly used medicinally | Synonyms: blue cohosh, blueberry root, Caulophyllum thalictrioides, Caulophyllum thalictroides, papoose root, squaw root, squawroot |
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| parotitis | (noun) inflammation of one or both parotid glands | - |
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| parrot | (noun) usually brightly colored zygodactyl tropical birds with short hooked beaks and the ability to mimic sounds | - |
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| (noun) a copycat who does not understand the words or acts being imitated | - |
| parrotfish | (noun) gaudy tropical fishes with parrotlike beaks formed by fusion of teeth | Synonyms: polly fish, pollyfish |
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| parthenote | (noun) a cell resulting from parthenogenesis | - |
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| patriot | (noun) one who loves and defends his or her country | Synonyms: nationalist |
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| patrioteer | (noun) an extreme bellicose nationalist | Synonyms: chauvinist, flag-waver, hundred-percenter, jingo, jingoist |
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| patriotism | (noun) love of country and willingness to sacrifice for it | Synonyms: nationalism |
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| pelota | (noun) a Basque or Spanish game played in a court with a ball and a wickerwork racket | Synonyms: jai alai |
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| peridot | (noun) a pale green variety of chrysolite; used as a gemstone | - |
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| peridotite | (noun) a dark coarse-grained igneous rock consisting principally of olivine | - |
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| perineotomy | (noun) surgical incision into the perineum | - |
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| persicot | (noun) a cordial made of the kernels of apricots, nectarines, etc., with refined spirit. | - |
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| peyote | (noun) the hallucinatory alkaloid that is the active agent in mescal buttons | Synonyms: mescaline |
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| (noun) a small spineless globe-shaped cactus; source of mescal buttons | Synonyms: Lophophora williamsii, mescal, mezcal |
| 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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| phlebothrombosis | (noun) thrombosis of a vein without prior inflammation of the vein; associated with sluggish blood flow (as in prolonged bedrest or pregnancy or surgery) or with rapid coagulation of the blood | Synonyms: venous thrombosis |
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| phlebotomist | (noun) someone who practices phlebotomy | - |
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| phlebotomus | (noun) a mild viral disease transmitted by the bite of the sand fly Phlebotomus papatasii | Synonyms: pappataci fever, sandfly fever |
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| phlebotomy | (noun) surgical incision into a vein; used to treat hemochromatosis | Synonyms: venesection |
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| phosphoprotein | (noun) containing chemically bound phosphoric acid | - |
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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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| photocopier | (noun) a copier that uses photographic methods of making copies | - |
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| photocopy | (noun) a photographic copy of written or printed or graphic work | - |
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| photoelectricity | (noun) electricity generated by light or affected by light | - |
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| photoelectron | (noun) an electron that is emitted from an atom or molecule by an incident photon | - |
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| photoemission | (noun) an emission of photoelectrons (especially from a metallic surface) | - |
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| photoengraving | (noun) an engraving used to reproduce an illustration | Synonyms: halftone, halftone engraving |
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| photoflash | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashbulb, flashgun |
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| photoflood | (noun) light that is a source of artificial illumination having a broad beam; used in photography | Synonyms: flood, flood lamp, floodlight |
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| photograph | (noun) a representation of a person or scene in the form of a print or transparent slide or in digital format | Synonyms: exposure, photo, pic, picture |
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| photographer | (noun) someone who takes photographs professionally | Synonyms: lensman |
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| photography | (noun) the act of taking and printing photographs | Synonyms: picture taking |
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| (noun) the occupation of taking and printing photographs or making movies | - |
| (noun) the process of producing images of objects on photosensitive surfaces | - |
| photogravure | (noun) using photography to produce a plate for printing | Synonyms: rotogravure |
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| (noun) an intaglio print produced by gravure | Synonyms: gravure, heliogravure |
| (noun) printing from an intaglio plate prepared by photographic methods | - |
| photoheliograph | (noun) a telescope, with a camera attached, used to photograph the Sun. | - |
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| photojournalism | (noun) journalism that presents a story primarily through the use of pictures | - |
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| photojournalist | (noun) a journalist who presents a story primarily through the use of photographs | - |
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| photolithograph | (noun) a lithograph produced by photographically produced plates | - |
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| photolithography | (noun) a planographic printing process using plates made from a photographic image | - |
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| photomechanics | (noun) the technique of using photomechanical methods to make photographs into plates for printing | - |
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| (noun) the process whereby printing surfaces (plates or cylinders) are produced by photographic methods | Synonyms: photoplate making |
| photometer | (noun) photographic equipment that measures the intensity of light | Synonyms: exposure meter, light meter |
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| (noun) measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source | - |
| photometrician | (noun) someone who practices photometry | Synonyms: photometrist |
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| photometrist | (noun) someone who practices photometry | Synonyms: photometrician |
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| photometry | (noun) measurement of the properties of light (especially luminous intensity) | - |
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| photomicrograph | (noun) a photograph taken with the help of a microscope | - |
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| photomontage | (noun) a montage that uses photographic images | - |
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| photomosaic | (noun) arrangement of aerial photographs forming a composite picture | Synonyms: arial mosaic, mosaic |
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| photon | (noun) a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle | - |
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| photophobia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photalgia |
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| (noun) a morbid fear of light | - |
| photopigment | (noun) a special pigment found in the rods and cones of the retina | - |
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| photoretinitis | (noun) damage to the retina resulting from exposure of the eye to the sun without adequate protection | - |
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| photosensitivity | (noun) sensitivity to the action of radiant energy | Synonyms: radiosensitivity |
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| photosphere | (noun) the intensely luminous surface of a star (especially the sun) | - |
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| photostat | (noun) a photocopy made on a Photostat machine | - |
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| photosynthesis | (noun) synthesis of compounds with the aid of radiant energy (especially in plants) | - |
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| phototelegraph | (noun) an apparatus for transmitting pictures by phototelegraphy. | - |
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| phototelegraphy | (noun) an early technology for the transmission of facsimiles. | - |
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| phototherapy | (noun) the use of strong light to treat acne or hyperbilirubinemia of the newborn | - |
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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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| physiotherapy | (noun) therapy that uses physical agents: exercise and massage and other modalities | Synonyms: physiatrics, physical therapy |
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| phytotherapy | (noun) the use of plants or plant extracts for medicinal purposes (especially plants that are not part of the normal diet) | Synonyms: botanical medicine, herbal therapy |
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| phytotoxin | (noun) any substance produced by plants that is similar in its properties to extracellular bacterial toxin | Synonyms: plant toxin |
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| picot | (noun) an edging of small loops, as on lace or ribbon | - |
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