| practicably | (adverb) in a practicable manner; so as to be feasible | Synonyms: feasibly |
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| practical | (adjective) concerned with actual use or practice | - |
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| (adjective) having or put to a practical purpose or use | - |
| (adjective) guided by practical experience and observation rather than theory | Synonyms: hard-nosed, hardheaded, pragmatic |
| (adjective) being actually such in almost every respect | Synonyms: virtual |
| practicality | (noun) concerned with actual use rather than theoretical possibilities | - |
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| practically | (adverb) almost; nearly | - |
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| (adverb) in a practical manner | - |
| (adverb) (degree adverb used before a noun phrase) for all practical purposes but not completely | Synonyms: much |
| practice | (noun) a customary way of operation or behavior | Synonyms: pattern |
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| (noun) systematic training by multiple repetitions | Synonyms: drill, exercise, practice session, recitation |
| (noun) the exercise of a profession | - |
| (noun) translating an idea into action | Synonyms: praxis |
| (noun) knowledge of how something is usually done | - |
| (verb) learn by repetition | Synonyms: drill, exercise, practise |
| (verb) engage in a rehearsal (of) | Synonyms: practise, rehearse |
| (verb) carry out or practice; as of jobs and professions | Synonyms: do, exercise, practise |
| (verb) avail oneself to | Synonyms: apply, use |
| (verb) engage in or perform | Synonyms: commit |
| practiced | (adjective) skillful after much practice | Synonyms: practised |
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| (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, expert, good, proficient, skilful, skillful |
| practician | (noun) someone who practices a learned profession | Synonyms: practitioner |
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| practise | (verb) learn by repetition | Synonyms: drill, exercise, practice |
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| (verb) engage in a rehearsal (of) | Synonyms: practice, rehearse |
| (verb) carry out or practice; as of jobs and professions | Synonyms: do, exercise, practice |
| practised | (adjective) skillful after much practice | Synonyms: practiced |
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| practitioner | (noun) someone who practices a learned profession | Synonyms: practician |
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| proactive | (adjective) descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently | - |
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| (adjective) (of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens | - |
| prolactin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, luteotropin |
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| prophylactic | (adjective) preventing or contributing to the prevention of disease | Synonyms: preventative, preventive |
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| (adjective) warding off | Synonyms: cautionary |
| (adjective) capable of preventing conception or impregnation | Synonyms: antifertility, contraceptive |
| (noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse | Synonyms: condom, rubber, safe, safety |
| (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventative, preventive |
| protactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protoactinium |
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| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
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| protract | (verb) lengthen in time; cause to be or last longer | Synonyms: draw out, extend, prolong |
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| protracted | (adjective) relatively long in duration; tediously protracted | Synonyms: drawn-out, extended, lengthy, prolonged |
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| protractedly | (adverb) in a slow, leisurely or prolonged way | Synonyms: lingeringly |
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| protractible | (adjective) able to be extended | Synonyms: protractile |
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| protractile | (adjective) able to be extended | Synonyms: protractible |
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| protraction | (noun) the act of prolonging something | Synonyms: lengthening, perpetuation, prolongation |
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| (noun) the consequence of being lengthened in duration | Synonyms: continuation, lengthiness, prolongation |
| protractor | (noun) drafting instrument used to draw or measure angles | - |
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| psychoactive | (adjective) affecting the mind or mood or other mental processes | Synonyms: psychotropic |
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| pterodactyl | (noun) extinct flying reptile | - |
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| putrefaction | (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, degeneracy, depravation, depravity |
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| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, rot, rotting |
| (noun) a state of decay usually accompanied by an offensive odor | Synonyms: rot |
| putrefactive | (adjective) causing or promoting bacterial putrefaction | Synonyms: putrefacient |
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| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| radioactively | (adverb) in a radioactive manner | - |
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| radioactivity | (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radiation |
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| rarefaction | (noun) a decrease in the density of something | - |
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| react | (verb) undergo a chemical reaction; react with another substance under certain conditions | - |
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| (verb) show a response or a reaction to something | Synonyms: respond |
| (verb) act against or in opposition to | Synonyms: oppose |
| reactance | (noun) opposition to the flow of electric current resulting from inductance and capacitance (rather than resistance) | - |
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| reactant | (noun) a chemical substance that is present at the start of a chemical reaction | - |
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| reaction | (noun) a bodily process occurring due to the effect of some antecedent stimulus or agent | Synonyms: response |
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| (noun) doing something in opposition to another way of doing it that you don't like | - |
| (noun) an idea evoked by some experience | - |
| (noun) extreme conservatism in political or social matters | - |
| (noun) (mechanics) the equal and opposite force that is produced when any force is applied to a body | - |
| (noun) a response that reveals a person's feelings or attitude | - |
| (noun) (chemistry) a process in which one or more substances are changed into others | Synonyms: chemical reaction |
| reactionary | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionist |
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| (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, ultraconservative |
| reactionism | (noun) the political orientation of reactionaries | - |
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| reactionist | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionary |
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| reactivate | (verb) activate (an old file) anew | - |
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| reactive | (adjective) participating readily in reactions | - |
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| (adjective) reacting to a stimulus | Synonyms: responsive |
| reactivity | (noun) responsive to stimulation | Synonyms: responsiveness |
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| (noun) ready susceptibility to chemical change | - |
| reactor | (noun) (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements | Synonyms: nuclear reactor |
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| (noun) an electrical device used to introduce reactance into a circuit | - |
| redact | (noun) someone who puts text into appropriate form for publication | Synonyms: redactor, reviser, rewrite man, rewriter |
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| (verb) prepare for publication or presentation by correcting, revising, or adapting | Synonyms: edit |
| (verb) formulate in a particular style or language | Synonyms: cast, couch, frame, put |
| redaction | (noun) the act of putting something in writing | - |
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| (noun) putting something (as a literary work or a legislative bill) into acceptable form | Synonyms: editing |
| redactor | (noun) someone who puts text into appropriate form for publication | Synonyms: redact, reviser, rewrite man, rewriter |
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| reenact | (verb) act out; represent or perform as if in a play | Synonyms: act out, enact |
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| (verb) enact or perform again | - |
| (verb) enact again | - |
| reenactment | (noun) performing a role in an event that occurred at an earlier time | - |
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| reenactor | (noun) a person who enacts a role in an event that occurred earlier | - |
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| refract | (verb) determine the refracting power of (a lens) | - |
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| (verb) subject to refraction | - |
| refractile | (adjective) of or relating to or capable of refraction | Synonyms: refractive |
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| refraction | (noun) the amount by which a propagating wave is bent | Synonyms: deflection, deflexion |
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| (noun) the change in direction of a propagating wave (light or sound) when passing from one medium to another | - |
| refractive | (adjective) of or relating to or capable of refraction | Synonyms: refractile |
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| (adjective) capable of changing the direction (of a light or sound wave) | Synonyms: deflective |
| refractiveness | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractivity |
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| refractivity | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractiveness |
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| refractometer | (noun) measuring instrument for measuring the refractive index of a substance | - |
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| refractoriness | (noun) the trait of being unmanageable | Synonyms: recalcitrance, recalcitrancy, unmanageableness |
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| refractory | (adjective) stubbornly resistant to authority or control | Synonyms: fractious, recalcitrant |
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| (adjective) temporarily unresponsive or not fully responsive to a process or stimulus | - |
| (adjective) not responding to treatment | Synonyms: stubborn |
| (noun) lining consisting of material with a high melting point; used to line the inside walls of a furnace | Synonyms: furnace lining |
| refracture | (verb) break (a bone) that was previously broken but mended in an abnormal way | - |
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| retract | (verb) formally reject or disavow a formerly held belief, usually under pressure | Synonyms: abjure, forswear, recant, resile |
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| (verb) pull inward or towards a center | Synonyms: draw in |
| (verb) use a surgical instrument to hold open (the edges of a wound or an organ) | Synonyms: draw back, pull back |
| (verb) pull away from a source of disgust or fear | Synonyms: shrink back |
| retractable | (adjective) capable of being retracted | - |
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| retracted | (adjective) drawn back and in | - |
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| retractile | (adjective) capable of retraction; capable of being drawn back | - |
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| retraction | (noun) the act of pulling or holding or drawing a part back | - |
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| (noun) a disavowal or taking back of a previous assertion | Synonyms: abjuration, recantation |
| retractor | (noun) surgical instrument that holds back the edges of a surgical incision | - |
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| retroactive | (adjective) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously | - |
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| (adjective) affecting things past | Synonyms: ex post facto, retro |
| retroactively | (adverb) after the fact | - |
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| satisfaction | (noun) act of fulfilling a desire or need or appetite | - |
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| (noun) the contentment one feels when one has fulfilled a desire, need, or expectation | - |
| (noun) compensation for a wrong | Synonyms: atonement, expiation |
| (noun) (law) the payment of a debt or fulfillment of an obligation | - |
| (noun) state of being gratified or satisfied | Synonyms: gratification |
| satisfactorily | (adverb) in a satisfactory manner | - |
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| satisfactoriness | (noun) the quality of giving satisfaction sufficient to meet a demand or requirement | - |
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| satisfactory | (adjective) giving satisfaction | - |
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| (adjective) meeting requirements | Synonyms: acceptable, decent |
| semiabstract | (adjective) characterized by stylized but recognizable subject matter | - |
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| spironolactone | (noun) a synthetic corticosteroid (trade name Aldactone) used to treat hypertension | Synonyms: Aldactone |
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| stacte | (noun) (Old Testament) one of several sweet-smelling spices used in incense | - |
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| stactometer | (noun) a device for investigating surface tension using the stalagmometric method. | Synonyms: stalagmometer, stalogometer |
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| stalactite | (noun) a cylinder of calcium carbonate hanging from the roof of a limestone cave | - |
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| stupefaction | (noun) the action of stupefying; making dull or lethargic | - |
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| (noun) marginal consciousness | Synonyms: grogginess, semiconsciousness, stupor |
| (noun) a feeling of stupefied astonishment | - |
| subcompact | (noun) a car smaller than a compact car | Synonyms: subcompact car |
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| subcontract | (noun) a contract assigning to another party some obligations of a prior contract | - |
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| (verb) work under a subcontract; engage in a subcontract | - |
| (verb) arranged for contracted work to be done by others | Synonyms: farm out, job |
| subcontractor | (noun) someone who enters into a subcontract with the primary contractor | - |
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| subtract | (verb) take off or away | - |
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| (verb) make a subtraction | Synonyms: deduct, take off |
| subtracter | (noun) a machine that subtracts numbers | - |
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| (noun) a person who subtracts numbers | - |
| subtraction | (noun) the act of subtracting (removing a part from the whole) | Synonyms: deduction |
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| (noun) an arithmetic operation in which the difference between two numbers is calculated | Synonyms: minus |
| subtractive | (adjective) constituting or involving subtraction | - |
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| subtractor | (noun) An electronic logic circuit for calculating the difference between two binary numbers. | - |
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| surfactant | (noun) a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved | Synonyms: surface-active agent, wetter, wetting agent |
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| syndactylism | (noun) birth defect in which there is partial or total webbing connecting two or more fingers or toes | Synonyms: syndactyly |
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| syndactyly | (noun) birth defect in which there is partial or total webbing connecting two or more fingers or toes | Synonyms: syndactylism |
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| syntactic | (adjective) of or relating to or conforming to the rules of syntax | Synonyms: syntactical |
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| syntactical | (adjective) of or relating to or conforming to the rules of syntax | Synonyms: syntactic |
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| syntactically | (adverb) with respect to syntax | - |
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| syntactician | (noun) a linguist who specializes in the study of grammar and syntax | Synonyms: grammarian |
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| tact | (noun) consideration in dealing with others and avoiding giving offense | Synonyms: tactfulness |
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| tactful | (adjective) having or showing a sense of what is fitting and considerate in dealing with others | - |
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| (adjective) showing skill and sensitivity in dealing with people | Synonyms: kid-glove |
| tactfully | (adverb) showing tact or tactfulness; in a tactful manner | - |
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| tactfulness | (noun) consideration in dealing with others and avoiding giving offense | Synonyms: tact |
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| (noun) Behavior or actions characterized by careful consideration in dealing with others, to avoid giving offense. | - |
| tactic | (noun) a plan for attaining a particular goal | Synonyms: maneuver, manoeuvre, tactics |
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| tactical | (adjective) of or pertaining to tactic or tactics | - |
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| tactically | (adverb) with regard to tactics | - |
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| tactician | (noun) a person who is skilled at planning tactics | - |
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| tactics | (noun) a plan for attaining a particular goal | Synonyms: maneuver, manoeuvre, tactic |
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| (noun) the branch of military science dealing with detailed maneuvers to achieve objectives set by strategy | - |
| tactile | (adjective) of or relating to or proceeding from the sense of touch | Synonyms: haptic, tactual |
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| (adjective) producing a sensation of touch | Synonyms: tactual |