| peristome | (noun) region around the mouth in various invertebrates | - |
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| (noun) (botany) fringe of toothlike appendages surrounding the mouth of a moss capsule | - |
| phenomenality | (noun) The state or property of being very remarkable; highly extraordinary; amazing. | - |
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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 | - |
| 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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| 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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| picometer | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometre |
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| picometre | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometer |
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| piezometer | (noun) a measuring instrument for measuring high pressures | - |
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| pluviometer | (noun) gauge consisting of an instrument to measure the quantity of precipitation | Synonyms: rain gage, rain gauge, udometer |
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| polychrome | (noun) a piece of work composed of or decorated in many colors | - |
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| pome | (noun) a fleshy fruit (apple or pear or related fruits) having seed chambers and an outer fleshy part | Synonyms: false fruit |
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| pomegranate | (noun) large globular fruit having many seeds with juicy red pulp in a tough brownish-red rind | - |
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| (noun) shrub or small tree native to southwestern Asia having large red many-seeded fruit | Synonyms: pomegranate tree, Punica granatum |
| pomelo | (noun) large pear-shaped fruit similar to grapefruit but with coarse dry pulp | Synonyms: shaddock |
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| (noun) southeastern Asian tree producing large fruits resembling grapefruits | Synonyms: Citrus decumana, Citrus grandis, Citrus maxima, pomelo tree, pummelo, shaddock |
| potentiometer | (noun) a resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets | Synonyms: pot |
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| (noun) a measuring instrument for measuring direct current electromotive forces | - |
| praenomen | (noun) the first name of a citizen of ancient Rome | - |
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| prodrome | (noun) an early symptom that a disease is developing or that an attack is about to occur | Synonyms: prodroma |
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| prolegomenon | (noun) a preliminary discussion inserted at the beginning of a book or treatise | - |
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| promenade | (noun) a leisurely walk (usually in some public place) | Synonyms: amble, perambulation, saunter, stroll |
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| (noun) a march of all the guests at the opening of a formal dance | - |
| (noun) a square dance figure; couples march counterclockwise in a circle | - |
| (noun) a public area set aside as a pedestrian walk | Synonyms: mall |
| (noun) a formal ball held for a school class toward the end of the academic year | Synonyms: prom |
| promethazine | (noun) antihistamine (trade name Phenergan) used to treat allergies; also an antiemetic used to treat motion sickness | Synonyms: Phenergan |
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| promethium | (noun) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium | Synonyms: atomic number 61, Pm |
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| proteome | (noun) the full complement of proteins produced by a particular genome | - |
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| proteosome | (noun) a form of vaccine that can be administered by an inhaler | Synonyms: proteosome vaccine |
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| psilomelane | (noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese | - |
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| psychometrics | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrika, psychometry |
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| psychometrika | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometry |
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| psychometry | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometrika |
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| psychrometer | (noun) a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air | - |
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| pycnometry | (noun) The determination of liquid density by weighing the liquid in a container (pycnometer) of known volume. | - |
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| pyrometer | (noun) a thermometer designed to measure high temperatures | - |
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| quarrelsomeness | (noun) an inclination to be quarrelsome and contentious | Synonyms: contentiousness |
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| radiometer | (noun) meter to detect and measure radiant energy (electromagnetic or acoustic) | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| radome | (noun) a housing for a radar antenna; transparent to radio waves | Synonyms: radar dome |
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| reflectometer | (noun) a meter that measures the reflectance of a surface | - |
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| refractometer | (noun) measuring instrument for measuring the refractive index of a substance | - |
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| rheometer | (noun) an instrument for measuring the flow of liquids (especially arterial blood) | - |
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| rhizome | (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rootstalk, rootstock |
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| ribosome | (noun) an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell | - |
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| roomer | (noun) a tenant in someone's house | Synonyms: boarder, lodger |
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| roomette | (noun) a small private compartment for one on a sleeping car | - |
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| salinometer | (noun) a hydrometer that determines the concentration of salt solutions by measuring their density | - |
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| sarcomere | (noun) one of the segments into which a myofibril is divided | - |
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| sarcosome | (noun) a large mitochondrion in a striated muscle fiber | - |
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| schistosome | (noun) flatworms parasitic in the blood vessels of mammals | Synonyms: blood fluke |
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| sclerometer | (noun) a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point | - |
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| sensitometer | (noun) a measuring instrument for measuring the light sensitivity of film over a range of exposures | - |
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| seriocomedy | (noun) a comedy with serious elements or overtones | Synonyms: tragicomedy |
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| servomechanism | (noun) control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system | Synonyms: servo, servosystem |
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| sevensome | (noun) seven people considered as a unit | Synonyms: septet, septette |
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| sixsome | (noun) six people considered as a unit | Synonyms: sextet, sextette |
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| sociometry | (noun) the quantitative study of social relationships | - |
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| somebody | (noun) a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential | Synonyms: individual, mortal, person, someone, soul |
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| someone | (noun) a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential | Synonyms: individual, mortal, person, somebody, soul |
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| somersault | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersaulting, somerset, summersault, summerset |
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| somersaulting | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersault, somerset, summersault, summerset |
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| somerset | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersault, somersaulting, summersault, summerset |
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| somesthesia | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesia, somaesthesis, somataesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesis |
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| (noun) the perception of tactual or proprioceptive or gut sensations | Synonyms: somaesthesia, somatesthesia, somatic sensation |
| somesthesis | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesia, somaesthesis, somataesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesia |
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| somewhere | (noun) an indefinite or unknown location | - |
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| sonometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: audiometer |
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| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrometry | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectroscopic analysis, spectroscopy, spectrum analysis |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| speedometer | (noun) a meter fixed to a vehicle that measures and displays its speed | Synonyms: speed indicator |
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| spherometer | (noun) a measuring instrument for measuring the curvature of a surface | - |
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| sphygmomanometer | (noun) a pressure gauge for measuring blood pressure | - |
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| spirometer | (noun) a measuring instrument for measuring the vital capacity of the lungs | - |
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| spirometry | (noun) the use of a spirometer to measure vital capacity | - |
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| splenomegaly | (noun) an abnormal enlargement of the spleen | - |
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| stactometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stalagmometer, stalogometer |
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| stalagmometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stactometer, stalogometer |
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| stalogometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stactometer, stalagmometer |
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| stereoisomer | (noun) any of a group of isomers in which atoms are linked in the same order but differ in their spatial arrangement. | - |
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| stoichiometry | (noun) (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers) | - |
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| synchromesh | (noun) an automotive system for shifting gears in which the gears revolve at the same speed and so shift smoothly | - |
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| syndrome | (noun) a complex of concurrent things | - |
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| (noun) a pattern of symptoms indicative of some disease | - |
| tacheometer | (noun) a theodolite designed for rapid measurements | Synonyms: tachymeter |
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| tachometer | (noun) measuring instrument for indicating speed of rotation | Synonyms: tach |
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| taxonomer | (noun) a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior | Synonyms: systematist, taxonomist |
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| telethermometer | (noun) a thermometer that registers the temperature at some distant point | - |
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| telomerase | (noun) an enzyme in eukaryotic cells that can add telomeres to the ends of chromosomes after they divide | - |
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| telomere | (noun) either (free) end of a eukaryotic chromosome | - |
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| tensiometer | (noun) a measuring instrument for measuring the surface tension of a liquid | - |
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| (noun) a measuring instrument for measuring the tension in a wire or fiber or beam | - |
| (noun) a measuring instrument for measuring the moisture content of soil | - |
| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| thermohydrometer | (noun) a hydrometer that includes a thermometer | Synonyms: thermogravimeter |
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| thermometer | (noun) measuring instrument for measuring temperature | - |
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| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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| thermometry | (noun) the measurement of temperature | - |
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| threesome | (noun) three people considered as a unit | Synonyms: triad, trinity, trio |
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| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, tierce, trey, triad, trine, trinity, trio, triplet, troika |
| thyromegaly | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, struma |
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| tichodrome | (noun) crimson-and-grey songbird that inhabits town walls and mountain cliffs of southern Eurasia and northern Africa | Synonyms: Tichodroma muriaria, wall creeper |
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| tintometer | (noun) a measuring instrument used in colorimetric analysis to determine the quantity of a substance from the color it yields with specific reagents | Synonyms: colorimeter |
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| tiresomeness | (noun) dullness owing to length or slowness | Synonyms: tediousness, tedium |
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| toilsomeness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, operoseness |
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| tome | (noun) a (usually) large and scholarly book | - |
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