| nontransmissible | (adjective) (of disease) not capable of being passed on | Synonyms: noncommunicable, noncontagious |
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| (adjective) not acquirable by inheritance | Synonyms: nonhereditary |
| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
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| orchestra | (noun) seating on the main floor in a theater | - |
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| (noun) a musical organization consisting of a group of instrumentalists including string players | - |
| orchestral | (adjective) relating to or composed for an orchestra | - |
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| orchestrate | (verb) plan and direct (a complex undertaking) | Synonyms: direct, engineer, mastermind, organise, organize |
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| (verb) write an orchestra score for | - |
| orchestrated | (adjective) arranged for performance by an orchestra | - |
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| orchestration | (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: instrumentation |
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| (noun) an arrangement of events that attempts to achieve a maximum effect | - |
| (noun) an arrangement of a piece of music for performance by an orchestra or band | - |
| orchestrator | (noun) an arranger who writes for orchestras | - |
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| osteostracan | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: cephalaspid |
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| ostracise | (verb) avoid speaking to or dealing with | Synonyms: ostracize |
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| (verb) expel from a community or group | Synonyms: ban, banish, blackball, cast out, ostracize, shun |
| ostracism | (noun) the act of excluding someone from society by general consent | - |
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| (noun) the state of being banished or ostracized (excluded from society by general consent) | Synonyms: banishment, Coventry |
| ostracize | (verb) avoid speaking to or dealing with | Synonyms: ostracise |
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| (verb) expel from a community or group | Synonyms: ban, banish, blackball, cast out, ostracise, shun |
| ostracod | (noun) tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell | Synonyms: mussel shrimp, seed shrimp |
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| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| outrage | (noun) the act of scandalizing | Synonyms: scandalisation, scandalization |
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| (noun) a wantonly cruel act | - |
| (noun) a disgraceful event | Synonyms: scandal |
| (noun) a feeling of righteous anger | Synonyms: indignation |
| (verb) strike with disgust or revulsion | Synonyms: appal, appall, offend, scandalise, scandalize, shock |
| (verb) force (someone) to have sex against their will | Synonyms: assault, dishonor, dishonour, rape, ravish, violate |
| (verb) violate the sacred character of a place or language | Synonyms: desecrate, profane, violate |
| outraged | (adjective) angered at something unjust or wrong | Synonyms: incensed, indignant, umbrageous |
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| outrageous | (adjective) greatly exceeding bounds of reason or moderation | Synonyms: exorbitant, extortionate, steep, unconscionable, usurious |
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| (adjective) grossly offensive to decency or morality; causing horror | Synonyms: hideous, horrid, horrific |
| outrageously | (adverb) to an extravagant or immoderate degree | Synonyms: atrociously |
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| (adverb) in a very offensive manner | - |
| outrageousness | (noun) the quality of being outrageous | Synonyms: enormity |
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| (noun) excessive excess | Synonyms: exorbitance |
| outrange | (verb) have a greater range than (another gun) | - |
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| outrank | (verb) take precedence or surpass others in rank | Synonyms: rank |
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| overstrain | (noun) too much strain | - |
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| (verb) strain excessively | Synonyms: overextend |
| oxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: hydroxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| palaestra | (noun) a public place in ancient Greece or Rome devoted to the training of wrestlers and other athletes | Synonyms: palestra |
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| palestra | (noun) a public place in ancient Greece or Rome devoted to the training of wrestlers and other athletes | Synonyms: palaestra |
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| pastrami | (noun) highly seasoned cut of smoked beef | - |
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| penetrability | (noun) the quality of being penetrable (by people or light or missiles etc.) | Synonyms: perviousness |
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| penetrable | (adjective) admitting of penetration or passage into or through | - |
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| (adjective) capable of being penetrated | - |
| penetralium | (noun) the innermost parts | - |
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| penetrate | (verb) come to understand | Synonyms: bottom, fathom |
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| (verb) become clear or enter one's consciousness or emotions | Synonyms: click, come home, dawn, fall into place, get across, get through, sink in |
| (verb) pass into or through, often by overcoming resistance | Synonyms: perforate |
| (verb) insert the penis into the vagina or anus of | - |
| (verb) spread or diffuse through | Synonyms: diffuse, imbue, interpenetrate, permeate, pervade, riddle |
| (verb) make one's way deeper into or through | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: infiltrate |
| penetrating | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrative, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrative |
| penetratingly | (adverb) with ability to see into deeply | Synonyms: penetratively |
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| penetration | (noun) an attack that penetrates into enemy territory | Synonyms: incursion |
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| (noun) the act of entering into or through something | - |
| (noun) the act (by a man) of inserting his penis into the vagina of a woman | - |
| (noun) the depth to which something penetrates (especially the depth reached by a projectile that hits a target) | - |
| (noun) the ability to make way into or through something | - |
| (noun) clear or deep perception of a situation | Synonyms: insight |
| penetrative | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrating, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrating |
| penetratively | (adverb) with ability to see into deeply | Synonyms: penetratingly |
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| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| pentylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentamethylenetetrazol |
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| perpetrate | (verb) perform an act, usually with a negative connotation | Synonyms: commit, pull |
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| perpetration | (noun) the act of committing a crime | Synonyms: commission, committal |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| pesantran | (noun) a Muslim school in Indonesia operated by religious leaders | Synonyms: pesantren |
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| plectranthus | (noun) any of various ornamental plants of the genus Plectranthus | - |
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| polytetrafluoroethylene | (noun) a material used to coat cooking utensils and in industrial applications where sticking is to be avoided | Synonyms: Teflon |
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| portrait | (noun) any likeness of a person, in any medium | Synonyms: portrayal |
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| (noun) a word picture of a person's appearance and character | Synonyms: portraiture, portrayal |
| portraitist | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portrayer |
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| portraiture | (noun) the activity of making portraits | - |
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| (noun) a word picture of a person's appearance and character | Synonyms: portrait, portrayal |
| portray | (verb) portray in words | - |
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| (verb) make a portrait of | Synonyms: depict, limn |
| (verb) assume or act the character of | Synonyms: impersonate |
| (verb) represent abstractly, for example in a painting, drawing, or sculpture | Synonyms: present |
| portrayal | (noun) representation by drawing or painting etc | Synonyms: delineation, depiction |
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| (noun) acting the part of a character on stage; dramatically representing the character by speech and action and gesture | Synonyms: characterization, enactment, personation |
| (noun) any likeness of a person, in any medium | Synonyms: portrait |
| (noun) a representation by picture or portraiture | Synonyms: depicting, depiction, portraying |
| (noun) a word picture of a person's appearance and character | Synonyms: portrait, portraiture |
| portrayed | (adjective) represented graphically by sketch or design or lines | Synonyms: depicted, pictured |
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| portrayer | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portraitist |
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| portraying | (noun) a representation by picture or portraiture | Synonyms: depicting, depiction, portrayal |
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| prostrate | (adjective) stretched out and lying at full length along the ground | Synonyms: flat |
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| (adjective) lying face downward | Synonyms: prone |
| (verb) render helpless or defenseless | - |
| (verb) throw down flat, as on the ground | - |
| (verb) get into a prostrate position, as in submission | Synonyms: bow down |
| prostration | (noun) the act of assuming a prostrate position | - |
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| (noun) abject submission; the emotional equivalent of prostrating your body | - |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: collapse |
| 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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| quatrain | (noun) a stanza of four lines | - |
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| racetrack | (noun) a course over which races are run | Synonyms: racecourse, raceway, track |
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| rattrap | (noun) a trap for catching rats | - |
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| (noun) filthy run-down dilapidated housing | - |
| (noun) a difficult entangling situation | - |
| recalcitrance | (noun) the trait of being unmanageable | Synonyms: recalcitrancy, refractoriness, unmanageableness |
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| recalcitrancy | (noun) the trait of being unmanageable | Synonyms: recalcitrance, refractoriness, unmanageableness |
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| recalcitrant | (adjective) marked by stubborn resistance to authority | - |
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| (adjective) stubbornly resistant to authority or control | Synonyms: fractious, refractory |
| recalcitrate | (verb) show strong objection or repugnance; manifest vigorous opposition or resistance; be obstinately disobedient | - |
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| reentrant | (adjective) (of angles) pointing inward | Synonyms: re-entrant |
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| registrant | (noun) a person who is formally entered (along with others) in a register (and who obtains certain rights thereby) | - |
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| registrar | (noun) someone responsible for keeping records | Synonyms: record-keeper, recorder |
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| (noun) the administrator responsible for student records | - |
| (noun) a person employed to keep a record of the owners of stocks and bonds issued by the company | - |
| registration | (noun) the act of enrolling | Synonyms: enrollment, enrolment |
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| (noun) the act of adjusting something to match a standard | Synonyms: adjustment, readjustment |
| (noun) (music) the sound property resulting from a combination of organ stops used to perform a particular piece of music; the technique of selecting and adjusting organ stops | - |
| (noun) a document certifying an act of registering | - |
| (noun) the body of people (such as students) who register or enroll at the same time | Synonyms: enrollment |
| remonstrance | (noun) the act of expressing earnest opposition or protest | Synonyms: expostulation, objection, remonstration |
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| remonstrate | (verb) argue in protest or opposition | - |
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| (verb) present and urge reasons in opposition | Synonyms: point out |
| (verb) censure severely or angrily | Synonyms: bawl out, berate, call down, call on the carpet, chew out, chew up, chide, dress down, have words, jaw, lambast, lambaste, lecture, rag, rebuke, reprimand, scold, take to task, trounce |
| remonstration | (noun) the act of expressing earnest opposition or protest | Synonyms: expostulation, objection, remonstrance |
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| restrain | (verb) prevent the action or expression of | Synonyms: hold back, keep, keep back |
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| (verb) to close within bounds, or otherwise limit or deprive of free movement | Synonyms: confine, constrain, hold |
| (verb) restrict (someone or something) so as to make free movement difficult | Synonyms: cumber, encumber |
| (verb) prevent (someone or something) from doing something | - |
| restrained | (adjective) under restraint | - |
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| (adjective) prudent | Synonyms: guarded |
| (adjective) marked by avoidance of extravagance or extremes | Synonyms: moderate |
| (adjective) cool and formal in manner | Synonyms: reticent, unemotional |
| (adjective) not showy or obtrusive | Synonyms: quiet |
| restrainer | (noun) a person who directs and restrains | Synonyms: controller |
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| (noun) a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film | - |
| restraint | (noun) the act of controlling by restraining someone or something | - |
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| (noun) a device that retards something's motion | Synonyms: constraint |
| (noun) discipline in personal and social activities | Synonyms: control |
| (noun) lack of ornamentation | Synonyms: chasteness, simpleness, simplicity |
| (noun) a rule or condition that limits freedom | - |
| (noun) the state of being physically constrained | Synonyms: constraint |
| retrace | (verb) reassemble mentally | Synonyms: construct, reconstruct |
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| (verb) to go back over again | Synonyms: trace |
| 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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| retrain | (verb) train again | - |
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| (verb) teach new skills | - |
| retraining | (noun) training for a new occupation | - |
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| retral | (adjective) moving or directed or tending in a backward direction or contrary to a previous direction | Synonyms: retrograde |
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| (adjective) at or near or toward the posterior | - |
| retranslate | (verb) translate again | - |
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| retransmit | (verb) transmit again | - |
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| rhinotracheitis | (noun) a respiratory infection of the nose and throat in cattle | - |
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| rostrate | (adjective) having a beak or beaklike snout or proboscis | - |
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| rupestral | (adjective) composed of or inscribed on rock | Synonyms: rupicolous |
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| satrap | (noun) a governor of a province in ancient Persia | - |
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| semestral | (adjective) occurring every six months or during every period of six months | Synonyms: semestrial |
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| semiabstract | (adjective) characterized by stylized but recognizable subject matter | - |
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| semitrailer | (noun) a trailer having wheels only in the rear; the front is supported by the towing vehicle | Synonyms: semi |
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| semitrance | (noun) a trancelike state in which the person can follow instructions but voluntary action is weak or absent | - |
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| semitransparency | (noun) the quality of allowing light to pass diffusely | Synonyms: translucence, translucency |
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