| mudspringer | (noun) found in tropical coastal regions of Africa and Asia; able to move on land on strong pectoral fins | Synonyms: mudskipper |
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| myxosporidian | (noun) mostly parasitic in fishes and including various serious pathogens | - |
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| newspaper | (noun) the physical object that is the product of a newspaper publisher | Synonyms: paper |
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| (noun) a daily or weekly publication on folded sheets; contains news and articles and advertisements | Synonyms: paper |
| (noun) a business firm that publishes newspapers | Synonyms: newspaper publisher, paper |
| (noun) cheap paper made from wood pulp and used for printing newspapers | Synonyms: newsprint |
| newspapering | (noun) journalism practiced for the newspapers | - |
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| newspaperman | (noun) a male journalist employed to provide news stories for newspapers or broadcast media | Synonyms: pressman |
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| newspaperwoman | (noun) a female journalist employed to provide news stories for newspapers or broadcast media | - |
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| newspeak | (noun) deliberately ambiguous and contradictory language used to mislead and manipulate the public | - |
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| newsperson | (noun) a person who investigates and reports or edits news stories | Synonyms: reporter |
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| newsprint | (noun) cheap paper made from wood pulp and used for printing newspapers | Synonyms: newspaper |
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| nightspot | (noun) a spot that is open late at night and that provides entertainment (as singers or dancers) as well as dancing and food and drink | Synonyms: cabaret, club, night club, nightclub |
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| offspring | (noun) any immature animal | Synonyms: young |
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| (noun) something that comes into existence as a result | Synonyms: materialisation, materialization |
| (noun) the immediate descendants of a person | Synonyms: issue, progeny |
| oligospermia | (noun) insufficient spermatozoa in the semen | - |
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| oosphere | (noun) a gamete; used especially of lower plants | - |
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| oospore | (noun) a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi | - |
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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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| osprey | (noun) large harmless hawk found worldwide that feeds on fish and builds a bulky nest often occupied for years | Synonyms: fish eagle, fish hawk, Pandion haliaetus, sea eagle |
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| outdoorsperson | (noun) a person who spends time outdoors (e.g., hunting or fishing) | - |
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| outspokenness | (noun) the trait of being blunt and outspoken | Synonyms: frankness |
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| overspill | (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overflow, runoff |
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| (noun) the relocation of people from overcrowded cities; they are accommodated in new houses or apartments in smaller towns | - |
| ozonosphere | (noun) a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun | Synonyms: ozone layer |
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| panspermia | (noun) The hypothesis that microorganisms may transmit life from outer space to habitable bodies; or the process of such transmission. | - |
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| paspalum | (noun) tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States | Synonyms: dallis grass, dallisgrass, Paspalum dilatatum |
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| passport | (noun) any quality or characteristic that gains a person a favorable reception or acceptance or admission | Synonyms: recommendation |
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| (noun) a document issued by a country to a citizen allowing that person to travel abroad and re-enter the home country | - |
| (noun) any authorization to pass or go somewhere | Synonyms: pass |
| perisperm | (noun) the nutritive tissue outside the sac containing the embryo in some seeds | - |
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| perspective | (noun) the appearance of things relative to one another as determined by their distance from the viewer | Synonyms: linear perspective |
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| (noun) a way of regarding situations or topics etc. | Synonyms: position, view |
| perspicaciousness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: astuteness, perspicacity, shrewdness |
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| perspicacity | (noun) the capacity to assess situations or circumstances shrewdly and to draw sound conclusions | Synonyms: judgement, judgment, sound judgement, sound judgment |
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| (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: astuteness, perspicaciousness, shrewdness |
| perspicuity | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuousness, plainness |
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| perspicuousness | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuity, plainness |
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| perspiration | (noun) salty fluid secreted by sweat glands | Synonyms: sudor, sweat |
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| (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: diaphoresis, hidrosis, sudation, sweating |
| perspirer | (noun) a person who perspires | Synonyms: sweater |
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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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| photosphere | (noun) the intensely luminous surface of a star (especially the sun) | - |
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| polyphosphate | (noun) a salt or ester of polyphosphoric acid | - |
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| predisposition | (noun) a disposition in advance to react in a particular way | - |
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| (noun) an inclination beforehand to interpret statements in a particular way | - |
| (noun) susceptibility to a pathogen | Synonyms: sensitivity |
| progymnosperm | (noun) an ancestral fossil type from which modern gymnosperms are thought to have derived | - |
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| prospect | (noun) a prediction of the course of a disease | Synonyms: medical prognosis, prognosis |
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| (noun) the visual percept of a region | Synonyms: aspect, panorama, scene, view, vista |
| (noun) belief about (or mental picture of) the future | Synonyms: expectation, outlook |
| (noun) someone who is considered for something (for an office or prize or honor etc.) | Synonyms: candidate |
| (noun) the possibility of future success | Synonyms: chance |
| prospectiveness | (noun) The quality of relating to or furnishing a future prospect. | - |
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| prospector | (noun) someone who explores an area for mineral deposits | - |
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| prospectus | (noun) a catalog listing the courses offered by a college or university | Synonyms: course catalog, course catalogue |
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| (noun) a formal written offer to sell securities (filed with the SEC) that sets forth a plan for a (proposed) business enterprise | - |
| prosperity | (noun) the condition of prospering; having good fortune | Synonyms: successfulness |
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| (noun) an economic state of growth with rising profits and full employment | - |
| prospicience | (noun) seeing ahead; knowing in advance; foreseeing | Synonyms: farsightedness, foresight, prevision |
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| pteridosperm | (noun) an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) | Synonyms: seed fern |
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| pyrophosphate | (noun) a salt or ester of pyrophosphoric acid | - |
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| rasp | (noun) a coarse file with sharp pointed projections | Synonyms: wood file |
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| (noun) uttering in an irritated tone | Synonyms: rasping |
| raspberry | (noun) a cry or noise made to express displeasure or contempt | Synonyms: bird, boo, Bronx cheer, hiss, hoot, razz, razzing, snort |
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| (noun) red or black edible aggregate berries usually smaller than the related blackberries | - |
| (noun) woody brambles bearing usually red but sometimes black or yellow fruits that separate from the receptacle when ripe and are rounder and smaller than blackberries | Synonyms: raspberry bush |
| raspiness | (noun) (of sound) The state or characteristic of being rough or raw, especially used to describe vocal quality. | - |
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| rasping | (noun) uttering in an irritated tone | Synonyms: rasp |
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| redisposition | (noun) the withdrawal and redistribution of forces in an attempt to use them more effectively | Synonyms: redeployment |
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| respect | (noun) behavior intended to please your parents | Synonyms: obedience |
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| (noun) a courteous expression (by word or deed) of esteem or regard | Synonyms: deference |
| (noun) courteous regard for people's feelings | Synonyms: deference, respectfulness |
| (noun) (usually preceded by `in') a detail or point | Synonyms: regard |
| (noun) an attitude of admiration or esteem | Synonyms: esteem, regard |
| (noun) a feeling of friendship and esteem | Synonyms: regard |
| (noun) the condition of being honored (esteemed or respected or well regarded) | Synonyms: esteem, regard |
| respectability | (noun) honorableness by virtue of being respectable and having a good reputation | Synonyms: reputability |
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| respecter | (noun) a person who respects someone or something; usually used in the negative | - |
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| respectfulness | (noun) courteous regard for people's feelings | Synonyms: deference, respect |
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| respects | (noun) (often used with `pay') a formal expression of esteem | - |
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| respiration | (noun) the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs | Synonyms: cellular respiration, internal respiration |
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| (noun) the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation | Synonyms: breathing, external respiration, ventilation |
| (noun) a single complete act of breathing in and out | - |
| respirator | (noun) a breathing device for administering long-term artificial respiration | Synonyms: inhalator |
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| (noun) a protective mask with a filter; protects the face and lungs against poisonous gases | Synonyms: gas helmet, gasmask |
| respite | (noun) a pause from doing something (as work) | Synonyms: break, recess, time out |
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| (noun) the act of reprieving; postponing or remitting punishment | Synonyms: reprieve |
| (noun) an interruption in the intensity or amount of something | Synonyms: abatement, hiatus, reprieve, suspension |
| (noun) a (temporary) relief from harm or discomfort | Synonyms: reprieve |
| (noun) a pause for relaxation | Synonyms: relief, rest, rest period |
| resplendence | (noun) brilliant radiant beauty | Synonyms: glory, resplendency |
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| resplendency | (noun) brilliant radiant beauty | Synonyms: glory, resplendence |
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| respondent | (noun) someone who responds | Synonyms: answerer, responder |
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| (noun) the codefendant (especially in a divorce proceeding) who is accused of adultery with the corespondent | - |
| responder | (noun) someone who responds | Synonyms: answerer, respondent |
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| response | (noun) a bodily process occurring due to the effect of some antecedent stimulus or agent | Synonyms: reaction |
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| (noun) the manner in which an electrical or mechanical device responds to an input signal or a range of input signals | - |
| (noun) the speech act of continuing a conversational exchange | Synonyms: reply |
| (noun) a statement (either spoken or written) that is made to reply to a question or request or criticism or accusation | Synonyms: answer, reply |
| (noun) the manner in which something is greeted | Synonyms: reception |
| (noun) a phrase recited or sung by the congregation following a versicle by the priest or minister | - |
| (noun) a result | - |
| responsibility | (noun) the social force that binds you to the courses of action demanded by that force | Synonyms: duty, obligation |
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| (noun) a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct | Synonyms: responsibleness |
| (noun) the proper sphere or extent of your activities | Synonyms: province |
| responsibleness | (noun) a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct | Synonyms: responsibility |
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| responsiveness | (noun) the quality of being responsive; reacting quickly; as a quality of people, it involves responding with emotion to people and events | - |
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| (noun) responsive to stimulation | Synonyms: reactivity |
| resuspension | (noun) a renewed suspension of insoluble particles after they have been precipitated | - |
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| retrospect | (noun) contemplation of things past | - |
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| retrospection | (noun) memory for experiences that are past | - |
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| (noun) reference to things past | - |
| retrospective | (noun) an exhibition of a representative selection of an artist's life work | - |
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| rhinosporidiosis | (noun) fungal infection of the nose; often acquired while swimming | - |
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| salesperson | (noun) a person employed to represent a business and to sell its merchandise (as to customers in a store or to customers who are visited) | Synonyms: sales rep, sales representative |
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| sandspur | (noun) grass of the eastern United States and tropical America having spikelets enclosed in prickly burs | Synonyms: Cenchrus tribuloides, field sandbur, sandbur |
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| sarcosporidian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcocystieian |
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| semitransparency | (noun) the quality of allowing light to pass diffusely | Synonyms: translucence, translucency |
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| sidesplitter | (noun) a joke that seems extremely funny | Synonyms: belly laugh, howler, riot, scream, thigh-slapper, wow |
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| silverspot | (noun) butterfly with silver spots on the underside of the hind wings | - |
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| soupspoon | (noun) a spoon with a rounded bowl for eating soup | Synonyms: soup spoon |
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| spa | (noun) a fashionable hotel usually in a resort area | Synonyms: resort hotel |
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| (noun) a place of business with equipment and facilities for exercising and improving physical fitness | Synonyms: health club, health spa |
| (noun) a health resort near a spring or at the seaside | Synonyms: watering hole, watering place |
| space | (noun) the unlimited expanse in which everything is located | Synonyms: infinite |
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| (noun) (printing) a block of type without a raised letter; used for spacing between words or sentences | Synonyms: quad |
| (noun) a blank character used to separate successive words in writing or printing | Synonyms: blank |
| (noun) a blank area | Synonyms: blank space, place |
| (noun) one of the areas between or below or above the lines of a musical staff | - |
| (noun) an area reserved for some particular purpose | - |
| (noun) any location outside the Earth's atmosphere | Synonyms: outer space |
| (noun) an empty area (usually bounded in some way between things) | - |
| (noun) the interval between two times | Synonyms: distance |
| spacecraft | (noun) a craft capable of traveling in outer space; technically, a satellite around the sun | Synonyms: ballistic capsule, space vehicle |
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| spacefaring | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spaceflight |
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| spaceflight | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spacefaring |
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| spaceman | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, cosmonaut |
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| spaceship | (noun) a spacecraft designed to carry a crew into interstellar space (especially in science fiction) | Synonyms: starship |
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| spacesuit | (noun) a pressure suit worn by astronauts while in outer space | - |
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| spacewalker | (noun) an astronaut who is active outside a spacecraft in outer space | - |
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| spacing | (noun) the property possessed by an array of things that have space between them | Synonyms: spatial arrangement |
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| (noun) the time between occurrences of a repeating event | - |
| spaciousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, commodiousness, roominess |
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| spackle | (noun) powder (containing gypsum plaster and glue) that when mixed with water forms a plastic paste used to fill cracks and holes in plaster | Synonyms: spackling compound |
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| spade | (noun) a sturdy hand shovel that can be pushed into the earth with the foot | - |
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| (noun) a playing card in the major suit that has one or more black figures on it | - |
| spadefish | (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: angelfish, Chaetodipterus faber |
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