| oligomenorrhea | (noun) abnormally light or infrequent menstruation | - |
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| omega | (noun) the last (24th) letter of the Greek alphabet | - |
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| (noun) the ending of a series or sequence | Synonyms: Z |
| omelet | (noun) beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly | Synonyms: omelette |
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| omelette | (noun) beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly | Synonyms: omelet |
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| omen | (noun) a sign of something about to happen | Synonyms: portent, presage, prodigy, prognostic, prognostication |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, auspicate, betoken, bode, forecast, foreshadow, foretell, portend, predict, prefigure, presage, prognosticate |
| omentum | (noun) a fold of peritoneum supporting the viscera | - |
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| omeprazole | (noun) antacid (trade name Prilosec) that suppresses acid secretion in the stomach | Synonyms: Prilosec |
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| omerta | (noun) a code of silence practiced by the Mafia; a refusal to give evidence to the police about criminal activities | - |
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| optometrist | (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: oculist |
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| optometry | (noun) the practice of an optometrist | - |
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| outcome | (noun) something that results | Synonyms: final result, result, resultant, termination |
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| (noun) a phenomenon that follows and is caused by some previous phenomenon | Synonyms: consequence, effect, event, issue, result, upshot |
| overcome | (verb) get on top of; deal with successfully | Synonyms: get over, master, subdue, surmount |
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| (verb) overcome, usually through no fault or weakness of the person that is overcome | Synonyms: get the best, have the best |
| (verb) win a victory over | Synonyms: defeat, get the better of |
| (verb) overcome, as with emotions or perceptual stimuli | Synonyms: overpower, overtake, overwhelm, sweep over, whelm |
| overcomer | (noun) someone who overcomes and establishes ascendancy and control by force or persuasion | Synonyms: subduer, surmounter |
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| palindrome | (noun) a word or phrase that reads the same backward as forward | - |
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| palometa | (noun) smaller than Florida pompano; common in West Indies | Synonyms: California pompano, Palometa simillima |
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| pedometer | (noun) measuring instrument for recording the number of steps taken in walking | - |
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| perchloromethane | (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, tetrachloromethane |
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| 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 | - |
| 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 | - |
| 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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| photomechanical | (adjective) of or relating to or involving various methods of using photography to make plates for printing | - |
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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 | - |
| photometric | (adjective) of or relating to photometry | Synonyms: photometrical |
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| photometrical | (adjective) of or relating to photometry | Synonyms: photometric |
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| photometrically | (adverb) by photometric means | - |
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| 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 | (adjective) having or exhibiting many colors | Synonyms: polychromatic, polychromic |
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| (noun) a piece of work composed of or decorated in many colors | - |
| (verb) color with many colors; make polychrome | Synonyms: polychromise, polychromize |
| 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 |
| (verb) take a leisurely walk | - |
| (verb) march in a procession in a public place | Synonyms: parade, troop |
| 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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| protogeometric | (adjective) characteristic of the earliest phase of geometric art especially in Greece | - |
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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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| psychometric | (adjective) of or relating to psychometrics | - |
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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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| quarrelsome | (adjective) given to quarreling | - |
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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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| ransomed | (adjective) reclaimed by payment of a ransom | - |
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| (adjective) saved from the bondage of sin | Synonyms: redeemed |
| 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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| servomechanical | (adjective) of or involving servomechanisms | Synonyms: servo |
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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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| some | (adjective) (quantifier) used with either mass nouns or plural count nouns to indicate an unspecified number or quantity | - |
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| (adjective) remarkable | - |
| (adjective) relatively many but unspecified in number | - |
| (adverb) (of quantities) imprecise but fairly close to correct | Synonyms: about, approximately, around, close to, just about, more or less, or so, roughly |
| 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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| someday | (adverb) some unspecified time in the future | - |
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| somehow | (adverb) in some unspecified way or manner; or by some unspecified means | Synonyms: someway, someways |
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| (adverb) for some unspecified reason | - |
| 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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| someplace | (adverb) in or at or to some place | Synonyms: somewhere |
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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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| (verb) do a somersault | - |
| 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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| sometime | (adjective) belonging to some prior time | Synonyms: erstwhile, former, old, one-time, onetime, quondam |
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| (adverb) at some indefinite or unstated time | - |
| sometimes | (adverb) on certain occasions or in certain cases but not always | - |
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| someway | (adverb) in some unspecified way or manner; or by some unspecified means | Synonyms: somehow, someways |
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| someways | (adverb) in some unspecified way or manner; or by some unspecified means | Synonyms: somehow, someway |
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| somewhat | (adverb) to certain extent or degree | Synonyms: fairly, jolly, middling, moderately, passably, pretty, reasonably |
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| (adverb) to a small degree or extent | Synonyms: more or less, slightly |