| focussing | (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focus, focusing |
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| folliculitis | (noun) inflammation of a hair follicle | - |
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| fucus | (noun) any member of the genus Fucus | - |
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| funicular | (noun) a railway up the side of a mountain pulled by a moving cable and having counterbalancing ascending and descending cars | Synonyms: cable railway, funicular railway |
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| funiculitis | (noun) inflammation of a funiculus (especially an inflammation of the spermatic cord) | - |
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| funiculus | (noun) any of several body structure resembling a cord | - |
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| (noun) the stalk of a plant ovule or seed | Synonyms: funicle |
| furcula | (noun) a forked bone formed by the fusion of the clavicles of most birds | - |
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| furunculosis | (noun) acute skin disease characterized by the presence of many furuncles | - |
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| gesticulation | (noun) a deliberate and vigorous gesture or motion | - |
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| goldcup | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, butterflower, crowfoot, kingcup |
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| gonococcus | (noun) the pus-producing bacterium that causes gonorrhea | Synonyms: Neisseria gonorrhoeae |
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| graticule | (noun) a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument | Synonyms: reticle, reticule |
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| guaiacum | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiac, lignum vitae |
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| (noun) medicinal resin from the lignum vitae tree | - |
| haircut | (noun) the act of cutting the hair | - |
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| (noun) the style in which hair has been cut | - |
| handcuff | (noun) shackle that consists of a metal loop that can be locked around the wrist; usually used in pairs | Synonyms: cuff, handlock, manacle |
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| hibiscus | (noun) any plant of the genus Hibiscus | - |
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| hiccup | (noun) (usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion | Synonyms: hiccough, singultus |
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| homunculus | (noun) a person who is very small but who is not otherwise deformed or abnormal | Synonyms: manikin, mannikin |
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| (noun) a tiny fully formed individual that (according to the discredited theory of preformation) is supposed to be present in the sperm cell | - |
| horticulture | (noun) the cultivation of plants | Synonyms: gardening |
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| horticulturist | (noun) an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants) | Synonyms: plantsman |
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| hyperacusia | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusis |
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| hyperacusis | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusia |
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| immaculacy | (noun) The characteristic of having no stain or blemish; of being spotless, undefiled, clear, pure. | - |
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| immaculateness | (noun) the state of being spotlessly clean | Synonyms: spotlessness |
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| impecuniousness | (noun) a state of lacking money | Synonyms: pennilessness, penuriousness |
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| inaccuracy | (noun) the quality of being inaccurate and having errors | - |
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| inconspicuousness | (noun) the quality of being not easily seen | - |
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| incubation | (noun) maintaining something at the most favorable temperature for its development | - |
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| (noun) sitting on eggs so as to hatch them by the warmth of the body | Synonyms: brooding |
| (noun) (pathology) the phase in the development of an infection between the time a pathogen enters the body and the time the first symptoms appear | - |
| incubator | (noun) apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants | Synonyms: brooder |
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| incubus | (noun) a male demon believed to lie on sleeping persons and to have sexual intercourse with sleeping women | - |
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| (noun) someone who depresses or worries others | - |
| (noun) a situation resembling a terrifying dream | Synonyms: nightmare |
| inculcation | (noun) teaching or impressing upon the mind by frequent instruction or repetition | Synonyms: ingraining, instilling |
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| inculpability | (noun) a state of innocence | Synonyms: blamelessness, guiltlessness, inculpableness |
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| inculpableness | (noun) a state of innocence | Synonyms: blamelessness, guiltlessness, inculpability |
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| inculpation | (noun) an accusation that you are responsible for some lapse or misdeed | Synonyms: blame, incrimination |
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| incumbency | (noun) the office of an incumbent | - |
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| (noun) a duty that is incumbent upon you | - |
| (noun) the term during which some position is held | Synonyms: tenure, term of office |
| incumbent | (noun) the official who holds an office | Synonyms: officeholder |
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| incumbrance | (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, interference, preventative, preventive |
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| (noun) an onerous or difficult concern | Synonyms: burden, encumbrance, load, onus |
| (noun) a charge against property (as a lien or mortgage) | Synonyms: encumbrance |
| incurability | (noun) incapability of being cured or healed | Synonyms: incurableness |
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| (noun) incapability of being altered in disposition or habits | - |
| incurable | (noun) a person whose disease is incurable | - |
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| incurableness | (noun) incapability of being cured or healed | Synonyms: incurability |
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| incurrence | (noun) the act of incurring (making yourself subject to something undesirable) | - |
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| incurring | (noun) acquiring or coming into something (usually undesirable) | - |
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| incursion | (noun) an attack that penetrates into enemy territory | Synonyms: penetration |
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| (noun) the act of entering some territory or domain (often in large numbers) | - |
| (noun) the mistake of incurring liability or blame | - |
| incurvation | (noun) the action of creating a curved shape | - |
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| (noun) a shape that curves or bends inward | Synonyms: concave shape, concavity, incurvature |
| incurvature | (noun) a shape that curves or bends inward | Synonyms: concave shape, concavity, incurvation |
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| incus | (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: anvil |
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| inoculant | (noun) a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease | Synonyms: inoculum |
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| inoculating | (noun) the act of protecting against disease by introducing a vaccine into the body to induce immunity | Synonyms: vaccinating |
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| inoculation | (noun) taking a vaccine as a precaution against contracting a disease | Synonyms: vaccination |
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| inoculator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: vaccinator |
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| inoculum | (noun) a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease | Synonyms: inoculant |
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| inosculation | (noun) a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous | Synonyms: anastomosis |
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| insecureness | (noun) the state of being exposed to risk or anxiety | - |
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| insecurity | (noun) the anxiety you experience when you feel vulnerable and insecure | - |
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| (noun) the state of being subject to danger or injury | - |
| interlocutor | (noun) a person who takes part in a conversation | Synonyms: conversational partner |
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| (noun) the performer in the middle of a minstrel line who engages the others in talk | Synonyms: middleman |
| iridoncus | (noun) swelling of the iris of the eye | - |
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| jocularity | (noun) activity characterized by good humor | Synonyms: jest, joke |
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| (noun) fun characterized by humor | Synonyms: jocosity |
| (noun) a feeling of facetious merriment | Synonyms: jocundity |
| jocundity | (noun) a feeling of facetious merriment | Synonyms: jocularity |
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| kencur | (noun) a dried rhizome or its powdered form of Kaempferia galanga, used in cooking in Indonesia. | - |
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| kingcup | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, butterflower, crowfoot, goldcup |
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| (noun) swamp plant of Europe and North America having bright yellow flowers resembling buttercups | Synonyms: Caltha palustris, cowslip, marsh marigold, May blob, meadow bright, water dragon |
| lacuna | (noun) a blank gap or missing part | Synonyms: blank |
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| lacunar | (noun) an ornamental sunken panel in a ceiling or dome | Synonyms: caisson, coffer |
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| lemniscus | (noun) a bundle of sensory nerve fibers going to the thalamus | Synonyms: fillet |
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| linecut | (noun) engraving consisting of a block that has been etched or engraved | Synonyms: line block, line engraving |
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| (noun) a print obtained from a line drawing | Synonyms: line engraving |
| linocut | (noun) a design carved in relief into a block of linoleum | - |
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| (noun) a print that is made from a design carved in relief into a block of linoleum | - |
| lobscuse | (noun) a stew of meat and vegetables and hardtack that is eaten by sailors | Synonyms: lobscouse, scouse |
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| locule | (noun) a small cavity or space within an organ or in a plant or animal | Synonyms: loculus |
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| loculus | (noun) a small cavity or space within an organ or in a plant or animal | Synonyms: locule |
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| locum | (noun) someone (physician or clergyman) who substitutes temporarily for another member of the same profession | Synonyms: locum tenens |
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| locus | (noun) the set of all points or lines that satisfy or are determined by specific conditions | - |
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| (noun) the scene of any event or action (especially the place of a meeting) | Synonyms: locale, venue |
| (noun) the specific site of a particular gene on its chromosome | - |
| locust | (noun) migratory grasshoppers of warm regions having short antennae | - |
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| (noun) any of various hardwood trees of the family Leguminosae | Synonyms: locust tree |
| (noun) hardwood from any of various locust trees | - |
| locution | (noun) a word or phrase that particular people use in particular situations | Synonyms: expression, saying |
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| lucubration | (noun) laborious cogitation | - |
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| (noun) a solemn literary work that is the product of laborious cogitation | - |
| macromolecule | (noun) any very large complex molecule; found only in plants and animals | Synonyms: supermolecule |
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| macula | (noun) a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision | Synonyms: macula lutea, macular area, yellow spot |
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| (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macule |
| (noun) a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field | Synonyms: sunspot |
| maculation | (noun) the act of spotting or staining something | Synonyms: spotting, staining |
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| (noun) a small contrasting part of something | Synonyms: dapple, fleck, patch, speckle, spot |
| macule | (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macula |
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| macumba | (noun) a Brazilian religious cult of African origin; combines voodoo elements with singing and chanting and dancing | - |
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| (noun) popular dance music of Brazil; derived from the practices of the macumba religious cult | - |
| (noun) (Brazil) followers of a religious cult of African origin | - |
| macushla | (noun) (an Irish term of address expressing affection) darling | - |
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| majuscule | (noun) one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis | Synonyms: capital, capital letter, upper-case letter, uppercase |
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| manicure | (noun) professional care for the hands and fingernails | - |
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| manicurist | (noun) a beautician who cleans and trims and polishes the fingernails | - |
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| masculine | (noun) a gender that refers chiefly (but not exclusively) to males or to objects classified as male | - |
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| masculinisation | (noun) the abnormal development of male sexual characteristics in a female (usually as the result of hormone therapies or adrenal malfunction) | Synonyms: masculinization, virilisation, virilization |
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| masculinity | (noun) the properties characteristic of the male sex | Synonyms: maleness |
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| (noun) the trait of behaving in ways considered typical for men | - |
| masculinization | (noun) the abnormal development of male sexual characteristics in a female (usually as the result of hormone therapies or adrenal malfunction) | Synonyms: masculinisation, virilisation, virilization |
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| matriculate | (noun) someone who has been admitted to a college or university | - |
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| matriculation | (noun) admission to a group (especially a college or university) | Synonyms: matric |
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| meniscus | (noun) (physics) the curved upper surface of a nonturbulent liquid in a vertical tube | - |
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| (noun) (optics) a lens that is concave on one side and convex on the other | - |
| (noun) (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint | Synonyms: semilunar cartilage |
| mercury | (noun) temperature measured by a mercury thermometer | - |
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| (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, hydrargyrum, quicksilver |
| meticulosity | (noun) strict attention to minute details | Synonyms: meticulousness, punctiliousness, scrupulousness |
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| meticulousness | (noun) strict attention to minute details | Synonyms: meticulosity, punctiliousness, scrupulousness |
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| microcircuit | (noun) a microelectronic computer circuit incorporated into a chip or semiconductor; a whole system rather than a single component | Synonyms: integrated circuit |
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| millicurie | (noun) a unit of radioactivity equal to one thousandth of a curie | - |
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| minicalculator | (noun) (old-fashioned) a very small handheld calculator. | - |
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| minuscule | (noun) a small cursive script developed from uncial between the 7th and 9th centuries and used in medieval manuscripts | - |
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| (noun) the characters that were once kept in bottom half of a compositor's type case | Synonyms: lower-case letter, lowercase, small letter |
| miscalculation | (noun) a mistake in calculating | Synonyms: misestimation, misreckoning |
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| miscue | (noun) a faulty shot in billiards; the cue tip slips off the cue ball | - |
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| (noun) a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc. | Synonyms: parapraxis, slip-up, slip |
| modicum | (noun) a small or moderate or token amount | - |
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| molecule | (noun) (physics and chemistry) the simplest structural unit of an element or compound | - |
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| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: atom, corpuscle, mote, particle, speck |