| infringement | (noun) a crime less serious than a felony | Synonyms: infraction, misdemeanor, misdemeanour, violation |
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| (noun) an act that disregards an agreement or a right | Synonyms: violation |
| infructescence | (noun) the fruiting stage of the inflorescence | - |
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| jackfruit | (noun) immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted | Synonyms: jack, jak |
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| (noun) East Indian tree cultivated for its immense edible fruit and seeds | Synonyms: Artocarpus heterophyllus, jackfruit tree |
| lakefront | (noun) land bordering a lake | - |
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| leapfrog | (noun) a game in which one child bends down and another leaps over | - |
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| (noun) advancing as if in the child's game, by leaping over obstacles or competitors | - |
| (verb) progress by large jumps instead of small increments | - |
| (verb) to vault | - |
| liebfraumilch | (noun) a sweetened Rhenish wine (especially one from Hesse in western Germany) | - |
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| mainframe | (noun) (computer science) the part of a computer (a microprocessor chip) that does most of the data processing | Synonyms: C.P.U., central processing unit, central processor, CPU, processor |
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| (noun) a large digital computer serving 100-400 users and occupying a special air-conditioned room | Synonyms: mainframe computer |
| oceanfront | (noun) land bordering an ocean | - |
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| palfrey | (noun) especially a light saddle horse for a woman | - |
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| permafrost | (noun) ground that is permanently frozen | - |
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| pomfret | (noun) deep-bodied sooty-black pelagic spiny-finned fish of the northern Atlantic and northern Pacific; valued for food | Synonyms: Brama raii |
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| prefrontal | (adjective) anterior to a frontal structure | - |
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| proofread | (verb) read for errors | Synonyms: proof |
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| proofreader | (noun) someone who reads proof in order to find errors and mark corrections | Synonyms: reader |
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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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| refrain | (noun) the part of a song where a soloist is joined by a group of singers | Synonyms: chorus |
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| (verb) choose not to consume | Synonyms: abstain, desist |
| (verb) resist doing something | Synonyms: forbear |
| refresh | (verb) make fresh again | Synonyms: freshen, refreshen |
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| (verb) become or make oneself fresh again | Synonyms: freshen, freshen up, refreshen |
| (verb) make (to feel) fresh | Synonyms: freshen |
| (verb) refresh one's memory | Synonyms: brush up, review |
| refreshed | (adjective) with restored energy | Synonyms: fresh, invigorated, reinvigorated |
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| refreshen | (verb) become or make oneself fresh again | Synonyms: freshen, freshen up, refresh |
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| (verb) make fresh again | Synonyms: freshen, refresh |
| refresher | (noun) a course that reviews and updates a topic for those who have not kept abreast of developments | Synonyms: refresher course |
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| (noun) a drink that refreshes | - |
| (noun) a fee (in addition to that marked on the brief) paid to counsel in a case that lasts more than one day | - |
| refreshful | (adjective) imparting vitality and energy | Synonyms: bracing, brisk, fresh, refreshing, tonic |
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| refreshfully | (adverb) in a manner that relieves fatigue and restores vitality | Synonyms: refreshingly |
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| refreshing | (adjective) imparting vitality and energy | Synonyms: bracing, brisk, fresh, refreshful, tonic |
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| (adjective) pleasantly new or different | Synonyms: novel |
| refreshingly | (adverb) in a pleasantly novel manner | - |
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| (adverb) in a manner that relieves fatigue and restores vitality | Synonyms: refreshfully |
| refreshment | (noun) activity that refreshes and recreates; activity that renews your health and spirits by enjoyment and relaxation | Synonyms: recreation |
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| (noun) snacks and drinks served as a light meal | - |
| refrigerant | (adjective) causing cooling or freezing | Synonyms: refrigerating |
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| (noun) any substance used to provide cooling (as in a refrigerator) | - |
| refrigerate | (verb) cool or chill in or as if in a refrigerator | - |
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| (verb) preserve by chilling | - |
| refrigerated | (adjective) made or kept cold by refrigeration | - |
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| refrigerating | (adjective) causing cooling or freezing | Synonyms: refrigerant |
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| refrigeration | (noun) deliberately lowering the body's temperature for therapeutic purposes | - |
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| (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: infrigidation |
| refrigerator | (noun) white goods in which food can be stored at low temperatures | Synonyms: icebox |
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| riffraff | (noun) disparaging terms for the common people | Synonyms: rabble, ragtag, ragtag and bobtail |
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| saffranine | (noun) any of a class of chiefly red organic dyes | Synonyms: safranin, safranine |
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| saffron | (noun) a shade of yellow tinged with orange | Synonyms: orange yellow |
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| (noun) dried pungent stigmas of the Old World saffron crocus | - |
| (noun) Old World crocus having purple or white flowers with aromatic pungent orange stigmas used in flavoring food | Synonyms: Crocus sativus, saffron crocus |
| safranin | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranine |
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| safranine | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranin |
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| sassafras | (noun) dried root bark of the sassafras tree | - |
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| (noun) yellowwood tree with brittle wood and aromatic leaves and bark; source of sassafras oil; widely distributed in eastern North America | Synonyms: Sassafras albidum, sassafras tree |
| saxifrage | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, rockfoil |
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| schoolfriend | (noun) a friend who attends the same school | - |
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| seafront | (noun) the waterfront of a seaside town | - |
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| shirtfront | (noun) a man's detachable insert (usually starched) to simulate the front of a shirt | Synonyms: dickey, dickie, dicky |
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| (noun) the front of a shirt (usually the part not covered by a jacket) | - |
| shopfront | (noun) the front side of a store facing the street; usually contains display windows | Synonyms: storefront |
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| storefront | (noun) the front side of a store facing the street; usually contains display windows | Synonyms: shopfront |
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| suffragan | (noun) an assistant or subordinate bishop of a diocese | Synonyms: suffragan bishop |
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| suffrage | (noun) a legal right guaranteed by the 15th amendment to the US Constitution; guaranteed to women by the 19th amendment | Synonyms: right to vote, vote |
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| suffragette | (noun) a woman advocate of women's right to vote (especially a militant advocate in the United Kingdom at the beginning of the 20th century) | - |
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| suffragism | (noun) the belief that the right to vote should be extended (as to women) | - |
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| suffragist | (noun) an advocate of the extension of voting rights (especially to women) | - |
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| suffrutescent | (adjective) of a plant; having a woody base that does not die down each year | - |
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| suffrutex | (noun) low-growing woody shrub or perennial with woody base | Synonyms: subshrub |
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| surfriding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfboarding, surfing |
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| taffrail | (noun) the railing around the stern of a ship | - |
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| therefrom | (adverb) from that place or from there | Synonyms: thence |
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| (adverb) from that circumstance or source | Synonyms: thence, thereof |
| unafraid | (adjective) oblivious of dangers or perils or calmly resolute in facing them | Synonyms: fearless |
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| (adjective) free from fear or doubt; easy in mind | Synonyms: secure, untroubled |
| underframe | (noun) the internal supporting structure that gives an artifact its shape | Synonyms: frame, skeletal frame, skeleton |
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| unframed | (adjective) not provided with a frame | - |
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| unfree | (adjective) hampered and not free; not able to act at will | - |
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| (adjective) held in servitude | - |
| unfreeze | (verb) become or cause to become soft or liquid | Synonyms: dethaw, dissolve, melt, thaw, unthaw |
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| (verb) make (assets) available | Synonyms: free, release, unblock |
| unfrequented | (adjective) devoid of creatures | Synonyms: lonely, solitary |
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| unfretted | (adjective) without frets | - |
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| unfriend | (verb) To remove someone from your list of friends on a social network | - |
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| unfriendliness | (noun) an unfriendly disposition | - |
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| (noun) dislike experienced as an absence of friendliness | - |
| unfriendly | (adjective) not disposed to friendship or friendliness | - |
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| (adjective) not easy to understand or use | - |
| (adjective) very unfavorable to life or growth | Synonyms: hostile, uncongenial |
| (adjective) not friendly | Synonyms: inimical |
| unfrightened | (adjective) not affected by fright | - |
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| unfrock | (verb) divest of the frock; of church officials | Synonyms: defrock |
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| unfrosted | (adjective) (of glass) lacking a frosted coating | - |
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| unfrozen | (adjective) not frozen | - |
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| unfruitful | (adjective) not fruitful; not conducive to abundant production | - |
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| unrefreshed | (adjective) not rested or refreshed | Synonyms: unrested |
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| upfront | (adjective) frank and honest | - |
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| usufruct | (noun) a legal right to use and derive profit from property belonging to someone else provided that the property itself is not injured in any way | - |
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| usufructuary | (adjective) of or relating to the nature of a usufruct | - |
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| (noun) someone who holds property by usufruct | - |
| waterfront | (noun) the area of a city (such as a harbor or dockyard) alongside a body of water | - |
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| wavefront | (noun) (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium | Synonyms: wave front |
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| wolfram | (noun) a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite | Synonyms: atomic number 74, tungsten, W |
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| wolframite | (noun) a mineral consisting of iron and manganese tungstate in crystalline form; the principal ore of tungsten; found in quartz veins associated with granitic rocks | Synonyms: iron manganese tungsten |
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