| ira | (noun) belligerence aroused by a real or supposed wrong (personified as one of the deadly sins) | Synonyms: anger, ire, wrath |
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| irascibility | (noun) a feeling of resentful anger | Synonyms: quick temper, short temper, spleen |
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| ire | (noun) belligerence aroused by a real or supposed wrong (personified as one of the deadly sins) | Synonyms: anger, ira, wrath |
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| (noun) a strong emotion; a feeling that is oriented toward some real or supposed grievance | Synonyms: anger, choler |
| iridectomy | (noun) an eye operation that treats closed-angle glaucoma by surgical removal of part of the iris of the eye | - |
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| iridescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: opalescence |
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| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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| iridocyclitis | (noun) inflammation of the iris and ciliary body of the eye | - |
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| iridokeratitis | (noun) inflammation of the iris and cornea of the eye | - |
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| iridoncus | (noun) swelling of the iris of the eye | - |
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| iridosmine | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: osmiridium |
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| iridotomy | (noun) a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma | - |
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| iris | (noun) diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening | Synonyms: iris diaphragm |
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| (noun) muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye | - |
| (noun) plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | Synonyms: flag, fleur-de-lis, sword lily |
| iritis | (noun) inflammation of the iris | - |
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| iron | (noun) home appliance consisting of a flat metal base that is heated and used to smooth cloth | Synonyms: smoothing iron |
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| (noun) a golf club that has a relatively narrow metal head | - |
| (noun) implement used to brand live stock | Synonyms: branding iron |
| (noun) a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood | Synonyms: atomic number 26, Fe |
| ironclad | (noun) a wooden warship of the 19th century that is plated with iron or steel armor | - |
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| ironing | (noun) the work of using heat to smooth washed clothes in order to remove any wrinkles | - |
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| (noun) garments (clothes or linens) that are to be (or have been) ironed | - |
| ironist | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ridiculer, satirist |
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| ironman | (noun) a strong man of exceptional physical endurance | Synonyms: iron man |
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| ironmonger | (noun) a store selling hardware | Synonyms: hardware store, ironmonger's shop |
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| (noun) someone who sells hardware | Synonyms: hardwareman |
| ironmongery | (noun) the merchandise that is sold in an ironmonger's shop | - |
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| irons | (noun) metal shackles; for hands or legs | Synonyms: chains |
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| ironside | (noun) a man of great strength or bravery | - |
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| ironware | (noun) instrumentalities (tools or implements) made of metal | Synonyms: hardware |
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| ironweed | (noun) any of various plants of the genus Vernonia of tropical and warm regions of especially North America that take their name from their loose heads of purple to rose flowers that quickly take on a rusty hue | Synonyms: vernonia |
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| ironwood | (noun) a small slow-growing deciduous tree of northern Iran having a low domed shape | Synonyms: iron-tree, iron tree, ironwood tree |
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| (noun) medium-sized hop hornbeam of eastern North America | Synonyms: Eastern hop hornbeam, ironwood tree, Ostrya virginiana |
| (noun) handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railroad ties | Synonyms: ironwood tree, Mesua ferrea, rose chestnut |
| (noun) exceptionally tough or hard wood of any of a number of ironwood trees | - |
| ironwork | (noun) work made of iron (gratings or rails or railings etc) | - |
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| ironworker | (noun) a person who makes articles of iron | - |
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| ironworks | (noun) the workplace where iron is smelted or where iron goods are made | - |
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| irony | (noun) incongruity between what might be expected and what actually occurs | - |
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| (noun) a trope that involves incongruity between what is expected and what occurs | - |
| (noun) witty language used to convey insults or scorn | Synonyms: caustic remark, sarcasm, satire |
| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
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| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |
| irrational | (noun) a real number that cannot be expressed as a rational number | Synonyms: irrational number |
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| irrationality | (noun) the state of being irrational; lacking powers of understanding | Synonyms: unreason |
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| irreality | (noun) the state of being insubstantial or imaginary; not existing objectively or in fact | Synonyms: unreality |
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| irredenta | (noun) a region that is related ethnically or historically to one country but is controlled politically by another | Synonyms: irridenta |
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| irredentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irridentism |
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| irredentist | (noun) an advocate of irredentism | Synonyms: irridentist |
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| irregular | (noun) merchandise that has imperfections; usually sold at a reduced price without the brand name | Synonyms: second |
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| (noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment | Synonyms: guerilla, guerrilla, insurgent |
| irregularity | (noun) behavior that breaches the rule or etiquette or custom or morality | Synonyms: abnormality |
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| (noun) not characterized by a fixed principle or rate; at irregular intervals | Synonyms: unregularity |
| (noun) an irregular asymmetry in shape; an irregular spatial pattern | Synonyms: geometrical irregularity |
| (noun) irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis | Synonyms: constipation |
| irrelevance | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevancy |
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| irrelevancy | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevance |
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| irreligion | (noun) the quality of not being devout | Synonyms: irreligiousness |
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| irreligionist | (noun) someone who is indifferent or hostile to religion | - |
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| irreligiousness | (noun) the quality of not being devout | Synonyms: irreligion |
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| irremovability | (noun) the quality or state of not being removable. | - |
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| irreplaceableness | (noun) the quality of being irreplaceable | - |
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| irrepressibility | (noun) irrepressible liveliness and good spirit | Synonyms: buoyancy |
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| irreproducibility | (noun) the quality of being unreproducible | - |
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| irresistibility | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibleness |
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| irresistibleness | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibility |
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| irresoluteness | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresolution |
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| irresolution | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresoluteness |
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| (noun) doubt concerning two or more possible alternatives or courses of action | Synonyms: indecision, indecisiveness |
| irresponsibility | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibleness |
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| irresponsibleness | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibility |
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| irreverence | (noun) a disrespectful act | Synonyms: violation |
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| (noun) an irreverent mental attitude | - |
| irreversibility | (noun) the quality of being irreversible (once done it cannot be changed) | - |
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| irrevocability | (noun) The state or condition of being impossible to retract or reverse; finality. | - |
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| irridenta | (noun) a region that is related ethnically or historically to one country but is controlled politically by another | Synonyms: irredenta |
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| irridentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irredentism |
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| irridentist | (noun) an advocate of irredentism | Synonyms: irredentist |
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| irrigation | (noun) supplying dry land with water by means of ditches etc | - |
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| (noun) (medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution | - |
| irritability | (noun) a disposition to exhibit uncontrolled anger | Synonyms: biliousness, peevishness, pettishness, snappishness, surliness, temper |
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| (noun) excessive sensitivity of an organ or body part | Synonyms: excitability |
| (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, peevishness, petulance |
| irritant | (noun) something that causes irritation and annoyance | Synonyms: thorn |
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| irritation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: aggravation, provocation |
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| (noun) the act of troubling or annoying someone | Synonyms: annoyance, annoying, vexation |
| (noun) an uncomfortable feeling of mental painfulness or distress | Synonyms: discomfort, soreness |
| (noun) a sudden outburst of anger | Synonyms: pique, temper |
| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, botheration, vexation |
| (noun) the neural or electrical arousal of an organ or muscle or gland | Synonyms: excitation, innervation |
| (noun) (pathology) abnormal sensitivity to stimulation | - |
| irruption | (noun) a sudden violent entrance; a bursting in | - |
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| (noun) a sudden violent spontaneous occurrence (usually of some undesirable condition) | Synonyms: eruption, outbreak |
| (noun) a sudden sharp increase in the relative numbers of a population | - |