| achromasia | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: lividity, lividness, luridness, paleness, pallidness, pallor, wanness |
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| achromatic | (adjective) having no hue | Synonyms: neutral |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| achromatise | (verb) remove color from | Synonyms: achromatize |
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| achromatism | (noun) the visual property of being without chromatic color | Synonyms: achromaticity, colorlessness, colourlessness |
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| achromatize | (verb) remove color from | Synonyms: achromatise |
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| achromatous | (adjective) having little or inadequate color | - |
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| achromia | (noun) an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells | - |
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| achromic | (adjective) having no color | Synonyms: achromous |
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| achromous | (adjective) having no color | Synonyms: achromic |
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| allochronic | (adjective) (of taxa) occurring in different geologic times | - |
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| anachronic | (adjective) chronologically misplaced | Synonyms: anachronistic, anachronous |
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| anachronism | (noun) an artifact that belongs to another time | - |
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| (noun) a person who seems to be displaced in time; who belongs to another age | - |
| (noun) something located at a time when it could not have existed or occurred | Synonyms: misdating, mistiming |
| anachronistic | (adjective) chronologically misplaced | Synonyms: anachronic, anachronous |
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| anachronistically | (adverb) in an anachronistic manner | - |
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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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| apochromatic | (adjective) corrected for both chromatic and spherical aberration | - |
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| asynchronism | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchrony, desynchronisation, desynchronization, desynchronizing |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| asynchrony | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, desynchronisation, desynchronization, desynchronizing |
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| bichromate | (noun) a salt of the hypothetical dichromic acid | Synonyms: dichromate |
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| bichromated | (adjective) treated or combined with bichromate | - |
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| bichrome | (adjective) having two colors | Synonyms: bicolor, bicolored, bicolour, bicoloured, dichromatic |
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| brachistochrone | (noun) a curve between two points along which a body can move under gravity in a shorter time than for any other curve. | - |
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| chroma | (noun) chromatic purity: freedom from dilution with white and hence vivid in hue | Synonyms: intensity, saturation, vividness |
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| chromaesthesia | (noun) a form of synesthesia in which nonvisual stimulation results in the experience of color sensations | Synonyms: chromesthesia |
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| chromate | (noun) any salt or ester of chromic acid | - |
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| chromatic | (adjective) being or having or characterized by hue | - |
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| (adjective) based on a scale consisting of 12 semitones | - |
| (adjective) able to refract light without spectral color separation | - |
| chromatically | (adverb) with respect to color | - |
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| chromaticity | (noun) the quality of a color as determined by its dominant wavelength | Synonyms: hue |
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| chromatid | (noun) one of two identical strands into which a chromosome splits during mitosis | - |
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| chromatin | (noun) the readily stainable substance of a cell nucleus consisting of DNA and RNA and various proteins; during mitotic division it condenses into chromosomes | Synonyms: chromatin granule |
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| chromatinic | (adjective) (of substance of a cell nucleus) readily colored by stains | - |
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| chromatism | (noun) abnormal pigmentation | - |
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| (noun) hallucinatory perception of colored lights | - |
| chromatogram | (noun) the recording (column or paper strip) on which the constituents of a mixture are adsorbed in chromatography | - |
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| chromatograph | (noun) equipment that enables a sophisticated separation, e.g. gas chromatographic or liquid chromatographic separation. | - |
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| chromatographic | (adjective) of or relating to chromatography | Synonyms: chromatographical |
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| chromatographical | (adjective) of or relating to chromatography | Synonyms: chromatographic |
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| chromatographically | (adverb) by means of a chromatographic process | - |
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| chromatography | (noun) a process used for separating mixtures by virtue of differences in absorbency | - |
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| chrome | (noun) another word for chromium when it is used in dyes or pigments | - |
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| (verb) treat with a chromium compound | - |
| (verb) plate with chromium | Synonyms: chromium-plate |
| chromesthesia | (noun) a form of synesthesia in which nonvisual stimulation results in the experience of color sensations | Synonyms: chromaesthesia |
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| chromite | (noun) a brownish-black mineral; the major source of chromium | - |
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| chromium | (noun) a hard brittle multivalent metallic element; resistant to corrosion and tarnishing | Synonyms: atomic number 24, Cr |
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| chromoblastomycosis | (noun) a fungal infection characterized by itchy warty nodules on the skin | - |
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| chromogen | (noun) a compound that can be converted to a pigment | - |
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| chromolithograph | (noun) a print made by chromolithography. | - |
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| chromolithography | (noun) single- or multi-color lithography | - |
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| chromophore | (noun) the chemical group that gives color to a molecule | - |
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| chromoplast | (noun) plastid containing pigments other than chlorophyll usually yellow or orange carotenoids | - |
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| chromosomal | (adjective) of or relating to a chromosome | - |
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| chromosome | (noun) a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order | - |
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| chromosphere | (noun) a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun | - |
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| chronic | (adjective) being long-lasting and recurrent or characterized by long suffering | - |
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| (adjective) persisting for a long time | Synonyms: continuing |
| (adjective) habitual | Synonyms: inveterate |
| chronically | (adverb) in a slowly developing and long lasting manner | - |
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| (adverb) in a habitual and longstanding manner | Synonyms: inveterate |
| chronicle | (noun) a record or narrative description of past events | Synonyms: account, history, story |
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| (verb) record in chronological order; make a historical record | - |
| chronicler | (noun) someone who writes chronicles | - |
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| chronograph | (noun) an accurate timer for recording time | - |
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| chronological | (adjective) relating to or arranged according to temporal order | - |
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| chronologically | (adverb) with respect to chronology | - |
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| chronologise | (verb) establish the order in time of something | Synonyms: chronologize |
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| chronologize | (verb) establish the order in time of something | Synonyms: chronologise |
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| chronology | (noun) the determination of the actual temporal sequence of past events | - |
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| (noun) a record of events in the order of their occurrence | - |
| (noun) an arrangement of events in time | - |
| chronometer | (noun) an accurate clock (especially used in navigation) | - |
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| chronoscope | (noun) an instrument for accurate measurements of small intervals of time | - |
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| cytochrome | (noun) (biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration) | - |
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| desynchronisation | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, asynchrony, desynchronization, desynchronizing |
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| desynchronise | (verb) cause to become desynchronized; cause to occur at unrelated times | Synonyms: desynchronize |
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| desynchronization | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, asynchrony, desynchronisation, desynchronizing |
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| desynchronize | (verb) cause to become desynchronized; cause to occur at unrelated times | Synonyms: desynchronise |
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| desynchronizing | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, asynchrony, desynchronisation, desynchronization |
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| diachronic | (adjective) used of the study of a phenomenon (especially language) as it changes through time | Synonyms: historical |
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| diachrony | (noun) the study of linguistic change | Synonyms: diachronic linguistics, historical linguistics |
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| dichroism | (noun) pleochroism of a crystal so that it exhibits two different colors when viewed from two different directions | - |
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| dichromacy | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromasy, dichromatism, dichromatopsia, dichromia |
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| dichromasy | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromatism, dichromatopsia, dichromia |
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| dichromat | (noun) a person with any of the various forms of dichromacy | - |
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| dichromate | (noun) a salt of the hypothetical dichromic acid | Synonyms: bichromate |
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| dichromatic | (adjective) of or relating to dichromatism | - |
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| (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicolour, bicoloured |
| dichromatism | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromasy, dichromatopsia, dichromia |
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| dichromatopsia | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromasy, dichromatism, dichromia |
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| dichromia | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromasy, dichromatism, dichromatopsia |
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| fluorochrome | (noun) any of various fluorescent substances used in fluorescence microscopy to stain specimens | - |
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| geosynchronous | (adjective) of or having an orbit with a fixed period of 24 hours (although the position in the orbit may not be fixed with respect to the earth) | - |
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| glottochronological | (adjective) pertaining to the study of the evolution of languages from a common source | - |
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| glottochronology | (noun) the determination of how long ago different languages evolved from a common source language | - |
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| hematochrome | (noun) a reddish coloring material found in some algae | - |
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| hemochromatosis | (noun) pathology in which iron accumulates in the tissues; characterized by bronzed skin and enlarged liver and diabetes mellitus and abnormalities of the pancreas and the joints | Synonyms: bronzed diabetes, iron-storage disease, iron overload |
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| homochromatic | (adjective) (of light or other electromagnetic radiation) having only one wavelength | Synonyms: monochromatic |
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| isochronal | (adjective) equal in duration or interval | Synonyms: isochronous |
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| isochrone | (noun) an isogram connecting points at which something occurs or arrives at the same time | - |
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| isochronism | (noun) the property of occuring regularly at equal time intervals, of maintaining a constant period or interval, despite variations in other measurable factors in the same system. | - |
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| isochronous | (adjective) equal in duration or interval | Synonyms: isochronal |
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| lunchroom | (noun) a restaurant (in a facility) where lunch can be purchased | - |
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| monochromacy | (noun) complete color blindness; colors can be differentiated only on the basis of brightness | Synonyms: monochromasy, monochromatic vision, monochromatism, monochromia |
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| monochromasy | (noun) complete color blindness; colors can be differentiated only on the basis of brightness | Synonyms: monochromacy, monochromatic vision, monochromatism, monochromia |
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| monochromat | (noun) a person who is completely color-blind | - |
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| monochromatic | (adjective) (of light or other electromagnetic radiation) having only one wavelength | Synonyms: homochromatic |
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| (adjective) of or relating to monochromatism | - |
| (adjective) having or appearing to have only one color | Synonyms: monochrome, monochromic, monochromous |