| airtight | (adjective) having no weak points | Synonyms: air-tight |
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| (adjective) not allowing air or gas to pass in or out | Synonyms: air-tight, gas-tight |
| anastigmat | (noun) compound lens or lens system designed to be free of astigmatism and able to form approximately point images | - |
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| anastigmatic | (adjective) not astigmatic | Synonyms: stigmatic |
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| (adjective) pertaining to a lens or lens system free of astigmatism (able to form point images) | Synonyms: stigmatic |
| antigen | (noun) any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies) | - |
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| antigenic | (adjective) of or relating to antigens | - |
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| antigram | (noun) an anagram that means the opposite of the original word or phrase | - |
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| astigmatic | (adjective) of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images | - |
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| astigmatism | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmia |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmia |
| astigmia | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmatism |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmatism |
| castigate | (verb) censure severely | Synonyms: chasten, chastise, correct, objurgate |
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| (verb) inflict severe punishment on | - |
| castigation | (noun) verbal punishment | Synonyms: chastisement |
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| (noun) a severe scolding | Synonyms: bawling out, chewing out, dressing down, earful, going-over, upbraiding |
| centigrade | (adjective) of or relating to a temperature scale on which the freezing point of water is 0 degrees and the boiling point of water is 100 degrees | - |
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| contiguity | (noun) the attribute of being so near as to be touching | Synonyms: adjacency, contiguousness |
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| contiguous | (adjective) very close or connected in space or time | Synonyms: immediate |
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| (adjective) connecting without a break; within a common boundary | Synonyms: conterminous |
| (adjective) having a common boundary or edge; abutting; touching | Synonyms: adjacent, conterminous, neighboring, neighbouring |
| contiguousness | (noun) the attribute of being so near as to be touching | Synonyms: adjacency, contiguity |
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| digitigrade | (adjective) (of mammals) walking on the toes with the posterior part of the foot raised (as cats, dogs, and horses do) | - |
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| (noun) an animal that walks so that only the toes touch the ground as e.g. dogs and cats and horses | Synonyms: digitigrade mammal |
| fastigiate | (adjective) having clusters of erect branches (often appearing to form a single column) | - |
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| fatigability | (noun) susceptibility to fatigue; a tendency to get tired or lose strength | - |
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| fatigue | (noun) labor of a nonmilitary kind done by soldiers (cleaning or digging or draining or so on) | Synonyms: fatigue duty |
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| (noun) (always used with a modifier) boredom resulting from overexposure to something | - |
| (noun) temporary loss of strength and energy resulting from hard physical or mental work | Synonyms: tiredness, weariness |
| (noun) used of materials (especially metals) in a weakened state caused by long stress | - |
| (verb) exhaust or get tired through overuse or great strain or stress | Synonyms: fag, fag out, jade, outwear, tire, tire out, wear, wear down, wear out, wear upon, weary |
| (verb) lose interest or become bored with something or somebody | Synonyms: jade, pall, tire, weary |
| fatigued | (adjective) drained of energy or effectiveness; extremely tired; completely exhausted | Synonyms: dog-tired, exhausted, fagged, gone, played out, spent, washed-out, worn-out, worn out |
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| fatigues | (noun) military uniform worn by military personnel when doing menial labor | - |
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| flibbertigibbet | (noun) a female fool | Synonyms: foolish woman |
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| fustigate | (verb) strike with a cudgel | Synonyms: cudgel |
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| hypermastigote | (noun) flagellate symbiotic in the intestines of e.g. termites | - |
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| impetiginous | (adjective) of or relating to or having impetigo | - |
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| impetigo | (noun) a very contagious infection of the skin; common in children; localized redness develops into small blisters that gradually crust and erode | - |
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| indefatigability | (noun) tireless determination | Synonyms: indefatigableness, tirelessness |
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| indefatigable | (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: tireless, unflagging, unwearying |
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| indefatigableness | (noun) tireless determination | Synonyms: indefatigability, tirelessness |
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| indefatigably | (adverb) with indefatigable energy | Synonyms: inexhaustibly, tirelessly |
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| instigant | (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigator, provoker |
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| instigate | (verb) provoke or stir up | Synonyms: incite, set off, stir up |
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| (verb) serve as the inciting cause of | Synonyms: inspire, prompt |
| instigation | (noun) deliberate and intentional triggering (of trouble or discord) | Synonyms: fomentation |
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| (noun) the verbal act of urging on | Synonyms: abetment, abettal |
| instigative | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, inflammatory, rabble-rousing, seditious |
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| instigator | (noun) a person who initiates a course of action | Synonyms: initiator |
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| (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigant, provoker |
| investigate | (verb) investigate scientifically | Synonyms: look into |
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| (verb) conduct an inquiry or investigation of | Synonyms: enquire, inquire |
| investigating | (noun) the work of inquiring into something thoroughly and systematically | Synonyms: investigation |
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| investigation | (noun) the work of inquiring into something thoroughly and systematically | Synonyms: investigating |
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| (noun) an inquiry into unfamiliar or questionable activities | Synonyms: probe |
| investigative | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigatory |
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| investigator | (noun) someone who investigates | - |
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| (noun) a scientist who devotes himself to doing research | Synonyms: research worker, researcher |
| (noun) a police officer who investigates crimes | Synonyms: detective, police detective, tec |
| investigatory | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigative |
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| lentiginose | (adjective) relating to or covered with or resembling freckles | Synonyms: freckled, lentiginous |
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| lentiginous | (adjective) relating to or covered with or resembling freckles | Synonyms: freckled, lentiginose |
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| lentigo | (noun) a small brownish spot (of the pigment melanin) on the skin | Synonyms: freckle |
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| litigant | (noun) (law) a party to a lawsuit; someone involved in litigation | Synonyms: litigator |
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| litigate | (verb) institute legal proceedings against; file a suit against | Synonyms: action, process, sue |
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| (verb) engage in legal proceedings | - |
| litigation | (noun) a legal proceeding in a court; a judicial contest to determine and enforce legal rights | Synonyms: judicial proceeding |
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| litigator | (noun) (law) a party to a lawsuit; someone involved in litigation | Synonyms: litigant |
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| litigious | (adjective) of or relating to litigation | - |
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| (adjective) inclined or showing an inclination to dispute or disagree, even to engage in law suits | Synonyms: combative, contentious, disputatious, disputative |
| litigiousness | (noun) a quarrelsome disposition to engage in or carry on lawsuits | - |
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| mantiger | (noun) a mythical monster having the head of man (with horns) and the body of a lion and the tail of a scorpion | Synonyms: mantichora, manticora, manticore |
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| mastigophoran | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophore |
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| mastigophore | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophoran |
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| mitigable | (adjective) capable of being alleviated | - |
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| mitigate | (verb) to temper | - |
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| (verb) lessen or to try to lessen the seriousness or extent of | Synonyms: extenuate, palliate |
| mitigated | (adjective) made less severe or intense | - |
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| mitigation | (noun) to act in such a way as to cause an offense to seem less serious | Synonyms: extenuation, palliation |
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| (noun) the action of lessening in severity or intensity | Synonyms: moderation |
| (noun) a partial excuse to mitigate censure; an attempt to represent an offense as less serious than it appears by showing mitigating circumstances | Synonyms: extenuation |
| mitigative | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, alleviatory, lenitive, mitigatory, palliative |
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| mitigatory | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, alleviatory, lenitive, mitigative, palliative |
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| neostigmine | (noun) a cholinergic drug (trade name Prostigmin) used to treat some ophthalmic conditions and to treat myasthenia gravis | Synonyms: Prostigmin |
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| overfatigue | (verb) tire excessively | Synonyms: overtire, overweary |
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| physostigmine | (noun) used in treatment of Alzheimer's disease and glaucoma | - |
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| plantigrade | (adjective) (of mammals) walking on the whole sole of the foot (as rabbits, raccoons, bears, and humans do) | - |
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| (noun) an animal that walks with the entire sole of the foot touching the ground as e.g. bears and human beings | Synonyms: plantigrade mammal |
| polymastigote | (noun) flagellates with several flagella | - |
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| prestige | (noun) a high standing achieved through success or influence or wealth etc. | Synonyms: prestigiousness |
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| prestigious | (adjective) exerting influence by reason of high status or prestige | - |
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| (adjective) having an illustrious reputation; respected | Synonyms: esteemed, honored, honoured |
| prestigiousness | (noun) a high standing achieved through success or influence or wealth etc. | Synonyms: prestige |
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| scintigram | (noun) a recording of the radioactivity emitted by a tracer in an organism or organ system. | - |
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| scintigraph | (noun) The apparatus used to make a scintigram. | Synonyms: scintiscanner |
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| skintight | (adjective) so tight as to cling to the skin | Synonyms: skin-tight |
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| steamtightness | (noun) The property of being being sealed in such a way that steam cannot leak out. | - |
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| sticktight | (noun) parasitic on especially the heads of chickens | Synonyms: Echidnophaga gallinacea, sticktight flea |
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| (noun) any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing | Synonyms: beggar's-ticks, beggar-ticks, bur marigold, burr marigold |
| stigma | (noun) a skin lesion that is a diagnostic sign of some disease | - |
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| (noun) an external tracheal aperture in a terrestrial arthropod | - |
| (noun) a symbol of disgrace or infamy | Synonyms: brand, mark, stain |
| (noun) the apical end of the style where deposited pollen enters the pistil | - |
| stigmata | (noun) marks resembling the wounds on the crucified body of Christ | - |
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| stigmatic | (adjective) not astigmatic | Synonyms: anastigmatic |
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| (adjective) pertaining to a lens or lens system free of astigmatism (able to form point images) | Synonyms: anastigmatic |
| (adjective) pertaining to or resembling or having stigmata | - |
| (noun) a person whose body is marked by religious stigmata (such as marks resembling the wounds of the crucified Christ) | Synonyms: stigmatist |
| stigmatisation | (noun) the act of stigmatizing | Synonyms: branding, stigmatization |
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| stigmatise | (verb) mark with a stigma or stigmata | Synonyms: stigmatize |
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| (verb) to accuse or condemn or openly or formally or brand as disgraceful | Synonyms: brand, denounce, mark, stigmatize |
| stigmatism | (noun) normal eyesight | - |
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| (noun) (optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point | - |
| (noun) the condition of having or being marked by stigmata | - |
| stigmatist | (noun) a person whose body is marked by religious stigmata (such as marks resembling the wounds of the crucified Christ) | Synonyms: stigmatic |
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| stigmatization | (noun) the act of stigmatizing | Synonyms: branding, stigmatisation |
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| stigmatize | (verb) mark with a stigma or stigmata | Synonyms: stigmatise |
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| (verb) to accuse or condemn or openly or formally or brand as disgraceful | Synonyms: brand, denounce, mark, stigmatise |
| stratigraphy | (noun) the branch of geology that studies the arrangement and succession of strata | - |
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| tertigravida | (noun) a woman who is pregnant for the third time | Synonyms: gravida III |
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| tettigoniid | (noun) grasshoppers with long threadlike antennae and well-developed stridulating organs on the forewings of the male | Synonyms: long-horned grasshopper |
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| tiger | (noun) large feline of forests in most of Asia having a tawny coat with black stripes; endangered | Synonyms: Panthera tigris |
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| (noun) a fierce or audacious person | - |
| tigerish | (adjective) resembling a tiger in fierceness and lack of mercy | - |
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| tight | (adjective) closely constrained or constricted or constricting | - |
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| (adjective) of such close construction as to be impermeable | - |
| (adjective) pressed tightly together | Synonyms: compressed |
| (adjective) packed closely together | - |
| (adjective) demanding strict attention to rules and procedures | Synonyms: rigorous, stringent |
| (adjective) exasperatingly difficult to handle or circumvent | Synonyms: nasty |
| (adjective) (of a contest or contestants) evenly matched | Synonyms: close |
| (adjective) of textiles | Synonyms: close |
| (adjective) very drunk | Synonyms: besotted, blind drunk, blotto, cockeyed, crocked, fuddled, loaded, pie-eyed, pissed, pixilated, plastered, slopped, sloshed, smashed, soaked, soused, sozzled, squiffy, stiff, wet |
| (adjective) set so close together as to be invulnerable to penetration | - |
| (adjective) affected by scarcity and expensive to borrow | - |
| (adjective) securely or solidly fixed in place; rigid | - |
| (adjective) (used of persons or behavior) characterized by or indicative of lack of generosity | Synonyms: mean, mingy, miserly |
| (adjective) pulled or drawn tight | Synonyms: taut |
| (adverb) firmly or closely | Synonyms: fast |
| (adverb) in an attentive manner | Synonyms: close, closely |
| tighten | (verb) become tight or tighter | - |
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| (verb) make tight or tighter | Synonyms: fasten |
| (verb) severely restrict in scope or extent | Synonyms: constrain, stiffen, tighten up |
| (verb) narrow or limit | Synonyms: reduce |
| tightening | (noun) the act of making something tighter | - |
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| tightfisted | (adjective) unwilling to part with money | Synonyms: closefisted, hardfisted |
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| tightfistedness | (noun) extreme stinginess | Synonyms: closeness, meanness, minginess, niggardliness, niggardness, parsimoniousness, parsimony, tightness |
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| tightfitting | (adjective) fitting snugly | Synonyms: skinny, tight-fitting, tight fitting, tightly fitting |
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| tightlipped | (adjective) inclined to secrecy or reticence about divulging information | Synonyms: close, closelipped, closemouthed, secretive |
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| tightly | (adverb) securely fixed or fastened | - |
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| (adverb) in a tight or constricted manner | - |
| tightness | (noun) lack of movement or room for movement | Synonyms: tautness |
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| (noun) extreme stinginess | Synonyms: closeness, meanness, minginess, niggardliness, niggardness, parsimoniousness, parsimony, tightfistedness |
| (noun) the spatial property of being crowded together | Synonyms: compactness, concentration, denseness, density |
| (noun) a tight feeling in some part of the body | Synonyms: constriction |
| (noun) a state occasioned by scarcity of money and a shortage of credit | Synonyms: stringency |
| tightrope | (noun) tightly stretched rope or wire on which acrobats perform high above the ground | - |
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| tights | (noun) skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls | Synonyms: leotards |
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| tightwad | (noun) a miserly person | Synonyms: cheapskate |
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| tiglon | (noun) offspring of a male tiger and a female lion | Synonyms: tigon |
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| tigon | (noun) offspring of a male tiger and a female lion | Synonyms: tiglon |
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