| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| amorous | (adjective) inclined toward or displaying love | Synonyms: amative |
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| (adjective) expressive of or exciting sexual love or romance | Synonyms: amatory, romantic |
| amorously | (adverb) in an amorous manner | - |
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| amorousness | (noun) a feeling of love or fondness | Synonyms: enamoredness |
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| (noun) the arousal of feelings of sexual desire | Synonyms: amativeness, eroticism, erotism, sexiness |
| apivorous | (adjective) feeding on bees | - |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| baccivorous | (adjective) feeding on berries | - |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| boron | (noun) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder | Synonyms: atomic number 5, B |
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| boronic | (adjective) of or relating to boron | - |
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| borosilicate | (noun) a salt of boric and silicic acids | - |
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| borough | (noun) one of the administrative divisions of a large city | - |
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| (noun) an English town that forms the constituency of a member of parliament | - |
| canorous | (adjective) richly melodious | Synonyms: songful |
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| carnivorous | (adjective) (used of plants as well as animals) feeding on animals | - |
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| (adjective) relating to or characteristic of carnivores | - |
| carnivorousness | (noun) The quality of being an animal that eats meat as the main part of its diet. | Synonyms: zoophagy |
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| carposporous | (adjective) having carpospores | - |
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| chloroacetophenone | (noun) a tear gas that is weaker than CS gas but lasts longer | Synonyms: CN gas |
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| chlorobenzene | (noun) a colorless volatile flammable liquid with an almond odor that is made from chlorine and benzene; used as a solvent and in the production of phenol and DDT and other organic compounds | - |
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| chlorobenzylidenemalononitrile | (noun) a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema | Synonyms: CS gas |
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| chlorofluorocarbon | (noun) a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans | Synonyms: CFC |
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| chloroform | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: trichloromethane |
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| (verb) anesthetize with chloroform | - |
| chlorofucin | (noun) the chlorophyll present in brown algae, diatoms, and flagellates | Synonyms: chlorophyll c |
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| chlorophyl | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyll |
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| chlorophyll | (noun) any of a group of green pigments found in photosynthetic organisms; there are four naturally occurring forms | Synonyms: chlorophyl |
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| chlorophyllose | (adjective) relating to or being or containing chlorophyll | Synonyms: chlorophyllous |
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| chlorophyllous | (adjective) relating to or being or containing chlorophyll | Synonyms: chlorophyllose |
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| chlorophyte | (noun) algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water | Synonyms: green algae |
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| chloropicrin | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: nitrochloroform |
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| chloroplast | (noun) plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis | - |
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| chloroplatinate | (noun) any salt of chloroplatinic acid. | - |
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| chloroprene | (noun) derivative of butadiene used in making neoprene by polymerization | - |
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| chloroquine | (noun) an antimalarial drug used to treat malaria and amebic dysentery and systemic lupus erythematosus | - |
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| chlorosis | (noun) iron deficiency anemia in young women; characterized by weakness and menstrual disturbances and a green color to the skin | Synonyms: greensickness |
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| chlorothiazide | (noun) a diuretic drug (trade name Diuril) used in the treatment of edema and hypertension | Synonyms: Diuril |
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| chlorotic | (adjective) of or pertaining to or suffering from chlorosis | Synonyms: greensick |
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| choroid | (noun) a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye | Synonyms: choroid coat |
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| clamorous | (adjective) conspicuously and offensively loud; given to vehement outcry | Synonyms: blatant, clamant, strident, vociferous |
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| clamorously | (adverb) in manner that attracts attention | Synonyms: loudly, obstreperously |
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| clangorous | (adjective) having a loud resonant metallic sound | Synonyms: clanging |
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| corolla | (noun) (botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth | - |
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| corollary | (noun) (logic) an inference that follows directly from the proof of another proposition | - |
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| (noun) a practical consequence that follows naturally | - |
| corona | (noun) a long cigar with blunt ends | - |
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| (noun) (anatomy) any structure that resembles a crown in shape | - |
| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: aureole |
| (noun) an electrical discharge accompanied by ionization of surrounding atmosphere | Synonyms: corona discharge, corposant, electric glow, Saint Elmo's fire, Saint Elmo's light, Saint Ulmo's fire, Saint Ulmo's light, St. Elmo's fire |
| (noun) one or more circles of light seen around a luminous object | - |
| (noun) (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower | - |
| (noun) a viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020 | Synonyms: 2019-nCoV acute respiratory disease, coronavirus, coronavirus disease 2019, COVID-19, novel coronavirus pneumonia, Wuhan coronavirus, Wuhan flu, Wuhan pneumonia, Wuhan virus |
| coronach | (noun) a song or hymn of mourning composed or performed as a memorial to a dead person | Synonyms: dirge, lament, requiem, threnody |
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| coronal | (noun) flower arrangement consisting of a circular band of foliage or flowers for ornamental purposes | Synonyms: chaplet, garland, lei, wreath |
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| coronary | (adjective) surrounding like a crown (especially of the blood vessels surrounding the heart) | - |
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| (noun) obstruction of blood flow in a coronary artery by a blood clot (thrombus) | Synonyms: coronary thrombosis |
| coronate | (verb) invest with regal power; enthrone | Synonyms: crown |
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| coronation | (noun) the ceremony of installing a new monarch | Synonyms: enthronement, enthronisation, enthronization, investiture |
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| coronavirus | (noun) a viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020 | Synonyms: 2019-nCoV acute respiratory disease, corona, coronavirus disease 2019, COVID-19, novel coronavirus pneumonia, Wuhan coronavirus, Wuhan flu, Wuhan pneumonia, Wuhan virus |
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| coroner | (noun) a public official who investigates by inquest any death not due to natural causes | Synonyms: medical examiner |
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| coronet | (noun) margin between the skin of the pastern and the horn of the hoof | - |
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| (noun) a small crown; usually indicates a high rank but below that of sovereign | - |
| coroneted | (adjective) belonging to the peerage | Synonyms: highborn, titled |
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| coronilla | (noun) any of various plants of the genus Coronilla having purple or pink or yellow flowers in long axillary heads or umbels | - |
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| coronion | (noun) the craniometric point at the tip of the coronoid process of the mandible | - |
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| corozo | (noun) any of several tropical American palms bearing corozo nuts | Synonyms: corozo palm |
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| coscoroba | (noun) large white South American bird intermediate in some respects between ducks and swans | - |
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| decorous | (adjective) characterized by propriety and dignity and good taste in manners and conduct | - |
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| (adjective) according with custom or propriety | Synonyms: becoming, comely, comme il faut, seemly |
| decorously | (adverb) in a proper and decorous manner | - |
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| decorousness | (noun) propriety in manners and conduct | Synonyms: decorum |
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| dextrorotary | (adjective) rotating to the right | Synonyms: dextrorotatory, right-handed |
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| dextrorotation | (noun) rotation to the right | Synonyms: clockwise rotation |
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| dextrorotatory | (adjective) rotating to the right | Synonyms: dextrorotary, right-handed |
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| dichlorodiphenyltrichloroethane | (noun) an insecticide that is also toxic to animals and humans; banned in the United States since 1972 | Synonyms: DDT |
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| dichloromethane | (noun) a nonflammable liquid used as a solvent and paint remover and refrigerant | Synonyms: methylene chloride |
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| dolorous | (adjective) showing sorrow | Synonyms: dolourous, lachrymose, tearful, weeping |
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| evaporometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: atmometer |
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| flavorous | (adjective) full of flavor | Synonyms: flavorful, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| fluoroboride | (noun) a salt of fluoroboric acid | - |
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| fluorocarbon | (noun) a halocarbon in which some hydrogen atoms have been replaced by fluorine; used in refrigerators and aerosols | - |
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| fluorochrome | (noun) any of various fluorescent substances used in fluorescence microscopy to stain specimens | - |
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| fluoroform | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: trifluoromethane |
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| fluoroscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: roentgenoscope |
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| fluoroscopy | (noun) examination of body structures using a fluoroscope | - |
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| fluorosis | (noun) a pathological condition resulting from an excessive intake of fluorine (usually from drinking water) | - |
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| fluorouracil | (noun) an antimetabolite used to treat certain cancers | - |
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| glamorous | (adjective) having an air of allure, romance and excitement | Synonyms: glamourous |
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| herbivorous | (adjective) feeding only on plants | - |
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| heterosporous | (adjective) characterized by heterospory | - |
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| hexachlorophene | (noun) antibacterial substance that is a water-soluble powder used in antiseptic soaps and toothpaste | - |
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| homosporous | (adjective) characterized by homospory | - |
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| horologe | (noun) a measuring instrument or device for keeping time | Synonyms: timekeeper, timepiece |
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| horologer | (noun) someone who makes or repairs watches | Synonyms: horologist, watchmaker |
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| horologist | (noun) someone who makes or repairs watches | Synonyms: horologer, watchmaker |
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| horology | (noun) the art of designing and making clocks | - |
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| horoscope | (noun) a diagram of the positions of the planets and signs of the zodiac at a particular time and place | - |
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| (noun) a prediction of someone's future based on the relative positions of the planets | - |
| horoscopy | (noun) the drawing up and interpretation of horoscopes | - |
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| humorous | (adjective) full of or characterized by humor | Synonyms: humourous |
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| humorously | (adverb) in a humorous manner | - |
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| humorousness | (noun) the trait of merry joking | Synonyms: jocoseness, jocosity, merriness |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydrochlorothiazide | (noun) a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension | Synonyms: Esidrix, HydroDIURIL, Microzide |
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| hydrofluorocarbon | (noun) a fluorocarbon emitted as a by-product of industrial manufacturing | Synonyms: HFC |
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| hydroxychloroquine | (noun) anti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosus | Synonyms: Plaquenil |
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| ichorous | (adjective) of or resembling or characterized by ichor or sanies | Synonyms: sanious |
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| indecorous | (adjective) lacking propriety and good taste in manners and conduct | Synonyms: indelicate |
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| (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, unbecoming, uncomely, unseemly, untoward |
| indecorously | (adverb) without decorousness | Synonyms: unbecomingly |
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| indecorousness | (noun) a lack of decorum | Synonyms: indecorum |
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