| 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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| 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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