| sulfonate | (noun) a salt of sulphonic acid | - |
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| sulfonylurea | (noun) antidiabetic consisting of any of several drugs that reduce the level of glucose in the blood; used to treat diabetes mellitus | - |
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| superfood | (noun) a food with health benefits | - |
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| surefooted | (adjective) not liable to error in judgment or action | Synonyms: confident, sure-footed |
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| (adjective) not liable to stumble or fall | Synonyms: footsure, sure-footed |
| tablefork | (noun) a fork for eating at a dining table | - |
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| tenderfoot | (noun) an inexperienced person (especially someone inexperienced in outdoor living) | - |
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| tenfold | (adjective) containing ten or ten parts | Synonyms: denary, ten-fold |
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| (adverb) by ten times as much | - |
| thenceforth | (adverb) from that time on | Synonyms: thereafter |
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| therefor | (adverb) (in formal usage, especially legal usage) for that or for it | - |
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| therefore | (adverb) (used to introduce a logical conclusion) from that fact or reason or as a result | Synonyms: hence, so, thence, thus |
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| (adverb) as a consequence | Synonyms: consequently |
| theretofore | (adverb) up to that time | - |
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| threefold | (adjective) three times as great or many | Synonyms: three-fold, treble, triple |
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| (adjective) having more than one decidedly dissimilar aspects or qualities | Synonyms: double, dual, three-fold, treble, two-fold, twofold |
| (adverb) by a factor of three | Synonyms: three times |
| tinfoil | (noun) foil made of tin or an alloy of tin and lead | Synonyms: tin foil |
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| tomfool | (noun) a person who lacks good judgment | Synonyms: fool, muggins, sap, saphead |
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| tomfoolery | (noun) foolish or senseless behavior | Synonyms: craziness, folly, foolery, indulgence, lunacy |
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| townsfolk | (noun) the people living in a municipality smaller than a city | Synonyms: town, townspeople |
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| transform | (verb) change or alter in form, appearance, or nature | Synonyms: transmute, transubstantiate |
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| (verb) change from one form or medium into another | Synonyms: translate |
| (verb) subject to a mathematical transformation | - |
| (verb) change in outward structure or looks | Synonyms: metamorphose, transmute |
| (verb) increase or decrease (an alternating current or voltage) | - |
| (verb) change (a bacterial cell) into a genetically distinct cell by the introduction of DNA from another cell of the same or closely related species | - |
| (verb) convert (one form of energy) to another | - |
| transformable | (adjective) capable of being changed in substance as if by alchemy | Synonyms: convertible, translatable, transmutable |
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| transformation | (noun) the act of changing in form or shape or appearance | Synonyms: translation |
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| (noun) (genetics) modification of a cell or bacterium by the uptake and incorporation of exogenous DNA | - |
| (noun) a rule describing the conversion of one syntactic structure into another related syntactic structure | - |
| (noun) a qualitative change | Synonyms: shift, transmutation |
| (noun) (mathematics) a function that changes the position or direction of the axes of a coordinate system | - |
| transformed | (adjective) given a completely different form or appearance | - |
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| transformer | (noun) an electrical device by which alternating current of one voltage is changed to another voltage | - |
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| trefoil | (noun) an architectural ornament in the form of three arcs arranged in a circle | - |
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| (noun) a plant of the genus Trifolium | Synonyms: clover |
| (noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves | Synonyms: medic, medick |
| trifoliata | (noun) small fast-growing spiny deciduous Chinese orange tree bearing sweetly scented flowers and decorative but inedible fruit: used as a stock in grafting and for hedges | Synonyms: Poncirus trifoliata, trifoliate orange, wild orange |
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| trifoliate | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliated, trifoliolate |
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| trifoliated | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliate, trifoliolate |
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| trifoliolate | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliate, trifoliated |
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| twofold | (adjective) twice as great or many | Synonyms: double, doubled, two-fold |
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| (adjective) having more than one decidedly dissimilar aspects or qualities | Synonyms: double, dual, three-fold, threefold, treble, two-fold |
| (adverb) by a factor of two | Synonyms: two times |
| umbelliform | (adjective) resembling or in the form of an umbel | - |
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| uncomfortable | (adjective) providing or experiencing physical discomfort | - |
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| (adjective) conducive to or feeling mental discomfort | - |
| uncomfortableness | (noun) embarrassment deriving from the feeling that others are critically aware of you | Synonyms: self-consciousness, uneasiness |
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| (noun) the state of being tense and feeling pain | Synonyms: discomfort |
| uncomfortably | (adverb) in physical discomfort | - |
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| unconformable | (adjective) not correspondent | - |
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| unconformist | (adjective) not conforming to some norm or socially approved pattern of behavior or thought | Synonyms: nonconformist |
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| underfoot | (adverb) under the feet | - |
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| (adverb) in the way and hindering progress | - |
| underperform | (verb) perform too rarely | - |
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| (verb) perform less well or with less success than expected | Synonyms: underachieve |
| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |
| unenforceable | (adjective) not enforceable; not capable of being brought about by compulsion | - |
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| unenforced | (adjective) not enforced; not compelled especially by legal or police action | - |
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| unfocused | (adjective) (of an image) not being in or brought into focus | Synonyms: unfocussed |
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| (adjective) not concentrated at one point or upon one objective | Synonyms: unfocussed |
| unfocussed | (adjective) (of an image) not being in or brought into focus | Synonyms: unfocused |
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| (adjective) not concentrated at one point or upon one objective | Synonyms: unfocused |
| unfold | (verb) develop or come to a promising stage | Synonyms: blossom, blossom forth, blossom out |
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| (verb) spread out or open from a closed or folded state | Synonyms: open, spread, spread out |
| (verb) extend or stretch out to a greater or the full length | Synonyms: extend, stretch, stretch out |
| (verb) open to the view | - |
| unfolding | (noun) a developmental process | Synonyms: flowering |
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| unfollow | (verb) to stop following a user on social media | - |
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| unforbearing | (adjective) unwilling to endure | - |
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| unforced | (adjective) not resulting from undue effort; not forced | Synonyms: unstrained |
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| (adjective) not brought about by coercion or force | Synonyms: uncoerced, willing |
| unforceful | (adjective) lacking force; feeble | Synonyms: forceless |
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| unforeseeable | (adjective) incapable of being anticipated | - |
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| unforeseen | (adjective) not anticipated | Synonyms: out of the blue, unanticipated, unlooked-for, unseen |
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| unforesightful | (adjective) lacking foresight or scope | Synonyms: myopic, short, shortsighted |
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| unforested | (adjective) not covered with forest | - |
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| unforethoughtful | (adjective) lacking forethought | - |
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| unforfeitable | (adjective) not subject to forfeiture | Synonyms: inalienable |
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| unforgettable | (adjective) impossible to forget | - |
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| unforgettably | (adverb) in a memorable manner | Synonyms: memorably |
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| unforgivable | (adjective) not excusable | Synonyms: inexcusable |
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| unforgivably | (adverb) in an unpardonable manner or to an unpardonable degree | Synonyms: inexcusably, unpardonably |
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| unforgiving | (adjective) unwilling or unable to forgive or show mercy | - |
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| (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, inexorable, relentless, stern, unappeasable, unrelenting |
| unforgivingly | (adverb) without forgiveness; in an unforgiving manner | - |
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| unforgivingness | (noun) The quality of having no allowance for weakness. | - |
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| unformed | (adjective) not having form or shape | - |
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| (adjective) not formed or organized | - |
| unfortunate | (adjective) not favored by fortune; marked or accompanied by or resulting in ill fortune | - |
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| (adjective) not auspicious; boding ill | Synonyms: inauspicious |
| (adjective) unsuitable or regrettable | - |
| (noun) a person who suffers misfortune | Synonyms: unfortunate person |
| unfortunately | (adverb) by bad luck | Synonyms: alas, regrettably, unluckily |
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| unfounded | (adjective) without a basis in reason or fact | Synonyms: baseless, groundless, idle, unwarranted, wild |
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| unifoliate | (adjective) having a single leaf | - |
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| uniform | (adjective) always the same; showing a single form or character in all occurrences | Synonyms: unvarying |
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| (adjective) not differentiated | Synonyms: undifferentiated |
| (adjective) the same throughout in structure or composition | Synonyms: consistent |
| (adjective) evenly spaced | - |
| (noun) clothing of distinctive design worn by members of a particular group as a means of identification | - |
| (verb) provide with uniforms | - |
| uniformed | (adjective) dressed in a uniform | - |
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| uniformise | (verb) make uniform | Synonyms: uniformize |
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| uniformity | (noun) the quality of lacking diversity or variation (even to the point of boredom) | Synonyms: uniformness |
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| (noun) a condition in which everything is regular and unvarying | - |
| uniformize | (verb) make uniform | Synonyms: uniformise |
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| uniformly | (adverb) in a uniform manner | - |
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| uniformness | (noun) the quality of lacking diversity or variation (even to the point of boredom) | Synonyms: uniformity |
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| uninformative | (adjective) lacking information | - |
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| uninformatively | (adverb) in an uninformative manner | Synonyms: uninstructively |
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| uninformed | (adjective) not informed; lacking in knowledge or information | - |
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| unperformed | (adjective) not performed | - |
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| unreformable | (adjective) unrepentant and incapable of being reformed | Synonyms: unregenerate |
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| (adjective) insusceptible of reform | Synonyms: irreclaimable, irredeemable, unredeemable |
| unreformed | (adjective) unaffected by the Reformation | - |
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| varicelliform | (adjective) resembling the rash of chickenpox | - |
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| variform | (adjective) varying in form or shape | - |
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| vasiform | (adjective) constituting a tube; having hollow tubes (as for the passage of fluids) | Synonyms: cannular, tube-shaped, tubelike, tubular |
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| vermiform | (adjective) resembling a worm; long and thin and cylindrical | Synonyms: worm-shaped |
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| waterfowl | (noun) freshwater aquatic bird | Synonyms: water bird, waterbird |
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| waveform | (noun) the shape of a wave illustrated graphically by plotting the values of the period quantity against time | Synonyms: wave form, wave shape |
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| webfoot | (noun) a foot having the toes connected by folds of skin | - |
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| wherefore | (noun) the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores' | Synonyms: why |
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| wildfowl | (noun) flesh of any of a number of wild game birds suitable for food | - |
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| workforce | (noun) the force of workers available | Synonyms: hands, manpower, men, work force |
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