| hyperthermal | (adjective) of or relating to or affected by hyperthermia | - |
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| hyphema | (noun) bleeding into the interior chamber of the eye | - |
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| hypodermal | (adjective) of or relating to the hypodermis | - |
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| hypogammaglobulinemia | (noun) an abnormally low concentration of gamma globulin in the blood and increased risk of infection | - |
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| hypozeugma | (noun) use of a series of subjects with a single predicate | - |
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| iceman | (noun) someone who cuts and delivers ice | - |
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| (noun) a professional killer | Synonyms: hatchet man |
| idiomatic | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatical |
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| idiomatical | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatic |
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| idiomatically | (adverb) in an idiomatic manner | - |
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| ilama | (noun) whitish tropical fruit with a pinkish tinge related to custard apples; grown in the southern United States | - |
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| (noun) tropical American tree grown in southern United States having a whitish pink-tinged fruit | Synonyms: Annona diversifolia, ilama tree |
| illegitimacy | (noun) unlawfulness by virtue of not being authorized by or in accordance with law | - |
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| (noun) the status of being born to parents who were not married | Synonyms: bar sinister, bastardy |
| illegitimate | (adjective) of marriages and offspring; not recognized as lawful | - |
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| (adjective) contrary to or forbidden by law | Synonyms: illicit, outlaw, outlawed, unlawful |
| (noun) the illegitimate offspring of unmarried parents | Synonyms: bastard, by-blow, illegitimate child, love child, whoreson |
| illegitimately | (adverb) of biological parents not married to each other | Synonyms: out of wedlock |
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| (adverb) in a manner disapproved or not allowed by custom | Synonyms: illicitly |
| image | (noun) a visual representation (of an object or scene or person or abstraction) produced on a surface | Synonyms: icon, ikon, picture |
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| (noun) a representation of a person (especially in the form of sculpture) | Synonyms: effigy, simulacrum |
| (noun) (Jungian psychology) a personal facade that one presents to the world | Synonyms: persona |
| (noun) the general impression that something (a person or organization or product) presents to the public | - |
| (noun) an iconic mental representation | Synonyms: mental image |
| (noun) a standard or typical example | Synonyms: epitome, paradigm, prototype |
| (noun) language used in a figurative or nonliteral sense | Synonyms: figure, figure of speech, trope |
| (noun) (mathematics) the set of values of the dependent variable for which a function is defined | Synonyms: range, range of a function |
| (noun) someone who closely resembles a famous person (especially an actor) | Synonyms: double, look-alike |
| (verb) imagine; conceive of; see in one's mind | Synonyms: envision, fancy, figure, picture, project, see, visualise, visualize |
| (verb) render visible, as by means of MRI | - |
| imagery | (noun) the ability to form mental images of things or events | Synonyms: imagination, imaging, mental imagery |
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| imaginable | (adjective) capable of being imagined | Synonyms: conceivable |
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| imaginary | (adjective) not based on fact; existing only in the imagination | Synonyms: fanciful, notional |
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| (noun) (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1 | Synonyms: complex number, complex quantity, imaginary number |
| imagination | (noun) the formation of a mental image of something that is not perceived as real and is not present to the senses | Synonyms: imaginativeness, vision |
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| (noun) the ability to form mental images of things or events | Synonyms: imagery, imaging, mental imagery |
| (noun) the ability to deal resourcefully with unusual problems | Synonyms: resource, resourcefulness |
| imaginative | (adjective) (used of persons or artifacts) marked by independence and creativity in thought or action | Synonyms: inventive |
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| imaginatively | (adverb) with imagination | - |
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| imaginativeness | (noun) the formation of a mental image of something that is not perceived as real and is not present to the senses | Synonyms: imagination, vision |
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| imagine | (verb) expect, believe, or suppose | Synonyms: guess, opine, reckon, suppose, think |
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| (verb) form a mental image of something that is not present or that is not the case | Synonyms: conceive of, envisage, ideate |
| imaging | (noun) (medicine) obtaining pictures of the interior of the body | Synonyms: tomography |
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| (noun) the ability to form mental images of things or events | Synonyms: imagery, imagination, mental imagery |
| imagism | (noun) a movement by American and English poets early in the 20th century in reaction to Victorian sentimentality; used common speech in free verse with clear concrete imagery | - |
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| imago | (noun) an adult insect produced after metamorphosis | - |
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| (noun) (psychoanalysis) an idealized image of someone (usually a parent) formed in childhood | - |
| imam | (noun) (Islam) the man who leads prayers in a mosque; for Shiites an imam is a recognized authority on Islamic theology and law and a spiritual guide | Synonyms: imaum |
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| imaret | (noun) a hostel for pilgrims in Turkey | - |
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| imaum | (noun) (Islam) the man who leads prayers in a mosque; for Shiites an imam is a recognized authority on Islamic theology and law and a spiritual guide | Synonyms: imam |
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| immaculacy | (noun) The characteristic of having no stain or blemish; of being spotless, undefiled, clear, pure. | - |
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| immaculate | (adjective) completely neat and clean | Synonyms: speckless, spic-and-span, spic, spick-and-span, spick, spotless |
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| (adjective) without fault or error | Synonyms: faultless, impeccable, incorrupted |
| (adjective) free from stain or blemish | Synonyms: undefiled |
| immaculately | (adverb) in an immaculate manner | - |
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| immaculateness | (noun) the state of being spotlessly clean | Synonyms: spotlessness |
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| immanence | (noun) the state of being within or not going beyond a given domain | Synonyms: immanency |
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| immanency | (noun) the state of being within or not going beyond a given domain | Synonyms: immanence |
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| immanent | (adjective) of a mental act performed entirely within the mind | Synonyms: subjective |
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| (adjective) of qualities that are spread throughout something | - |
| immaterial | (adjective) not consisting of matter | Synonyms: nonmaterial |
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| (adjective) of no importance or relevance especially to a law case | - |
| (adjective) without material form or substance | Synonyms: incorporeal |
| (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, impertinent, orthogonal |
| (adjective) (often followed by `to') lacking importance; not mattering one way or the other | Synonyms: indifferent |
| immaterialise | (verb) render immaterial or incorporeal | Synonyms: immaterialize, unsubstantialise, unsubstantialize |
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| immateriality | (noun) the quality of not being physical; not consisting of matter | Synonyms: incorporeality |
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| (noun) complete irrelevance requiring no further consideration | - |
| immaterialize | (verb) render immaterial or incorporeal | Synonyms: immaterialise, unsubstantialise, unsubstantialize |
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| immature | (adjective) not yet mature | - |
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| (adjective) characteristic of a lack of maturity | - |
| (adjective) (used of living things especially persons) in an early period of life or development or growth | Synonyms: young |
| (adjective) (of birds) not yet having developed feathers | Synonyms: unfledged |
| (adjective) not fully developed or mature; not ripe | Synonyms: green, unripe, unripened |
| immaturely | (adverb) in an immature manner | Synonyms: jejunely |
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| immatureness | (noun) not having reached maturity | Synonyms: immaturity |
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| immaturity | (noun) not having reached maturity | Synonyms: immatureness |
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| impermanence | (noun) the property of not existing for indefinitely long durations | Synonyms: impermanency |
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| impermanency | (noun) the property of not existing for indefinitely long durations | Synonyms: impermanence |
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| impermanent | (adjective) not permanent; not lasting | Synonyms: temporary |
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| (adjective) existing or enduring for a limited time only | - |
| imprimatur | (noun) formal and explicit approval | Synonyms: countenance, endorsement, indorsement, sanction, warrant |
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| inanimacy | (noun) (linguistics) The characteristic of a noun, in some languages, that is dependent on its unliving or non-sentient nature; this characteristic affects grammatical features (it can modify verbs used with the noun, affect the noun's declension etc). | - |
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| inanimate | (adjective) not endowed with life | Synonyms: non-living, nonliving |
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| (adjective) belonging to the class of nouns denoting nonliving things | - |
| (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: breathless, pulseless |
| inanimateness | (noun) not having life | Synonyms: lifelessness |
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| inestimable | (adjective) beyond calculation or measure | Synonyms: immeasurable, incomputable |
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| infantryman | (noun) fights on foot with small arms | Synonyms: foot soldier, footslogger, marcher |
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| infinitesimal | (adjective) infinitely or immeasurably small | Synonyms: minute |
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| (noun) (mathematics) a variable that has zero as its limit | - |
| infirmary | (noun) a health facility where patients receive treatment | Synonyms: hospital |
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| inflammability | (noun) the quality of being easily ignited and burning rapidly | Synonyms: flammability |
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| inflammable | (adjective) easily ignited | Synonyms: flammable |
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| inflammation | (noun) arousal to violent emotion | Synonyms: inflaming |
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| (noun) the act of setting something on fire | Synonyms: firing, ignition, kindling, lighting |
| (noun) a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat | Synonyms: redness, rubor |
| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervor, fervour |
| inflammatory | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, instigative, rabble-rousing, seditious |
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| (adjective) characterized or caused by inflammation | - |
| infliximab | (noun) an anti-TNF compound (trade name Remicade) consisting of an antibody directed against TNF; it is given intravenously at one-month to three-month intervals; used in treatment of regional enteritis and rheumatoid arthritis | Synonyms: Remicade |
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| (noun) a monoclonal antibody (trade name Remicade) used to treat Crohn's disease and rheumatoid arthritis; administered by infusion; use and dosage must be determined by a physician | Synonyms: Remicade |
| informal | (adjective) not formal | - |
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| (adjective) used of spoken and written language | - |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, intimate |
| (adjective) not officially recognized or controlled | Synonyms: loose |
| informality | (noun) a manner that does not take forms and ceremonies seriously | - |
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| (noun) freedom from constraint or embarrassment | Synonyms: ease |
| informally | (adverb) without formality | - |
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| (adverb) with the use of colloquial expressions | Synonyms: colloquially, conversationally |
| informant | (noun) a person who supplies information | Synonyms: source |
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| (noun) someone who sees an event and reports what happened | Synonyms: witness, witnesser |
| informatics | (noun) the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information | Synonyms: information processing, information science, IP |
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| information | (noun) (communication theory) a numerical measure of the uncertainty of an outcome | Synonyms: entropy, selective information |
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| (noun) knowledge acquired through study or experience or instruction | - |
| (noun) a message received and understood | Synonyms: info |
| (noun) formal accusation of a crime | - |
| (noun) a collection of facts from which conclusions may be drawn | Synonyms: data |
| informational | (adjective) relating to or having the nature of information | - |
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| informative | (adjective) providing or conveying information | Synonyms: informatory |
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| (adjective) tending to increase knowledge or dissipate ignorance | Synonyms: enlightening, illuminating |
| (adjective) serving to instruct or enlighten or inform | Synonyms: instructive |
| informatively | (adverb) in an informative manner | Synonyms: instructively |
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| informatory | (adjective) providing or conveying information | Synonyms: informative |
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| infrahuman | (adjective) belonging to a group below humans in evolutionary development | - |
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| inframaxillary | (adjective) relating to the lower jaw | Synonyms: mandibular |
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| inhuman | (adjective) without compunction or human feeling | Synonyms: cold-blooded, cold, insensate |
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| (adjective) belonging to or resembling something nonhuman | - |
| inhumane | (adjective) lacking and reflecting lack of pity or compassion | - |
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| inhumanely | (adverb) in an inhumane manner | - |
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| inhumaneness | (noun) the quality of lacking compassion or consideration for others | Synonyms: inhumanity |
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| inhumanity | (noun) an act of atrocious cruelty | Synonyms: atrocity |
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| (noun) the quality of lacking compassion or consideration for others | Synonyms: inhumaneness |
| inhumation | (noun) the ritual placing of a corpse in a grave | Synonyms: burial, entombment, interment, sepulture |
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| inmarriage | (noun) marriage within one's own tribe or group as required by custom or law | Synonyms: endogamy, intermarriage |
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| inmarry | (verb) marry within one's own tribe or group | - |
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| inmate | (noun) one of several resident of a dwelling (especially someone confined to a prison or hospital) | - |
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| (noun) a patient who is residing in the hospital where he is being treated | Synonyms: inpatient |
| (noun) a person serving a sentence in a jail or prison | Synonyms: con, convict, yard bird, yardbird |
| intermarriage | (noun) marriage within one's own tribe or group as required by custom or law | Synonyms: endogamy, inmarriage |
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| (noun) marriage to a person belonging to a tribe or group other than your own as required by custom or law | Synonyms: exogamy |
| intermarry | (verb) marry within the same ethnic, social, or family group | - |
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| intima | (noun) the innermost membrane of an organ (especially the inner lining of an artery or vein or lymphatic vessel) | - |
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| intimacy | (noun) close or warm friendship | Synonyms: closeness, familiarity |
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| (noun) a feeling of being intimate and belonging together | Synonyms: closeness |
| (noun) a usually secretive or illicit sexual relationship | Synonyms: affair, affaire, amour, involvement, liaison |
| intimal | (adjective) of or relating to the intima | - |
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| intimate | (adjective) marked by close acquaintance, association, or familiarity | - |
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| (adjective) thoroughly acquainted through study or experience | Synonyms: knowledgeable, versed |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, informal |
| (adjective) innermost or essential | Synonyms: inner, internal |
| (adjective) concerning things deeply private and personal | Synonyms: private |
| (adjective) used euphemistically to refer to the genitals | - |
| (adjective) involved in a sexual relationship | Synonyms: sexual |
| (adjective) having mutual interests or affections; of established friendship | Synonyms: familiar |
| (noun) someone to whom private matters are confided | Synonyms: confidant |
| (verb) give to understand | Synonyms: adumbrate, insinuate |
| (verb) imply as a possibility | Synonyms: suggest |
| intimately | (adverb) in a close manner | Synonyms: closely, nearly |
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| (adverb) with great or especially intimate knowledge | Synonyms: well |
| intimation | (noun) a slight suggestion or vague understanding | Synonyms: glimmer, glimmering, inkling |
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| (noun) an indirect suggestion | Synonyms: breath, hint |
| intradermal | (adjective) relating to areas between the layers of the skin | Synonyms: intracutaneous, intradermic |
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| intradermally | (adverb) into the skin | - |
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| ironman | (noun) a strong man of exceptional physical endurance | Synonyms: iron man |
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| irreclaimable | (adjective) insusceptible of reform | Synonyms: irredeemable, unredeemable, unreformable |
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| irredeemable | (adjective) (of paper money) not convertible into coin at the pleasure of the holder | - |
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| (adjective) insusceptible of reform | Synonyms: irreclaimable, unredeemable, unreformable |
| isoseismal | (noun) a line on a map connecting points at which earthquake shocks are of equal intensity. | - |
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| isothermal | (adjective) of a process or change taking place at constant temperature | - |
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| jacamar | (noun) tropical American insectivorous bird having a long sharp bill and iridescent green or bronze plumage | - |
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| jazzman | (noun) a musician who plays or composes jazz music | Synonyms: jazz musician |
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| jiggermast | (noun) any small mast on a sailing vessel; especially the mizzenmast of a yawl | Synonyms: jigger |
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| journeyman | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artificer, artisan, craftsman |
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| juryman | (noun) a male who serves (or waits to be called to serve) on a jury | - |
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