| aneurysm | (noun) a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall | Synonyms: aneurism |
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| cherrystone | (noun) a half-grown quahog | Synonyms: cherrystone clam |
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| (noun) small quahog larger than a littleneck; eaten raw or cooked as in e.g. clams casino | Synonyms: cherrystone clam |
| chrysalis | (noun) pupa of a moth or butterfly enclosed in a cocoon | - |
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| chrysanthemum | (noun) any of numerous perennial Old World herbs having showy brightly colored flower heads of the genera Chrysanthemum, Argyranthemum, Dendranthema, Tanacetum; widely cultivated | - |
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| (noun) the flower of a chrysanthemum plant | - |
| chrysarobin | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: araroba, Goa powder |
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| chrysoberyl | (noun) a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone | - |
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| chrysolite | (noun) a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone | - |
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| chrysomelid | (noun) brightly colored beetle that feeds on plant leaves; larvae infest roots and stems | Synonyms: leaf beetle |
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| chrysopid | (noun) pale green unpleasant-smelling lacewing fly having carnivorous larvae | Synonyms: green lacewing, stink fly |
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| chrysoprase | (noun) a green variety of chalcedony valued as a gemstone | - |
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| chrysotherapy | (noun) the use of chemicals containing gold for treating diseases (such as rheumatoid arthritis) | - |
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| chrysotile | (noun) a grey or green fibrous mineral; an important source of commercial asbestos | - |
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| countryseat | (noun) an estate in the country | - |
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| countryside | (noun) rural regions | - |
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| crystal | (noun) a protective cover that protects the face of a watch | Synonyms: watch crystal, watch glass |
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| (noun) glassware made of quartz | - |
| (noun) a crystalline element used as a component in various electronic devices | - |
| (noun) a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces | Synonyms: crystallization |
| (noun) a solid formed by the solidification of a chemical and having a highly regular atomic structure | - |
| (noun) colorless glass made of almost pure silica | Synonyms: lechatelierite, quartz, quartz glass, vitreous silica |
| crystallinity | (noun) (chemistry) The degree of structural order in a solid. | - |
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| crystallisation | (noun) the formation of crystals | Synonyms: crystallization, crystallizing |
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| crystallite | (noun) any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock | - |
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| crystallization | (noun) a mental synthesis that becomes fixed or concrete by a process resembling crystal formation | - |
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| (noun) a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces | Synonyms: crystal |
| (noun) the formation of crystals | Synonyms: crystallisation, crystallizing |
| crystallizing | (noun) the formation of crystals | Synonyms: crystallisation, crystallization |
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| crystallogen | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, Group 14 element, tetragen, tetrel |
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| crystallographer | (noun) a specialist in crystallography | - |
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| crystallography | (noun) the branch of science that studies the formation and structure of crystals | - |
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| erysipelas | (noun) an acute streptococcal infection characterized by deep-red inflammation of the skin and mucous membranes | - |
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| lepidobotrys | (noun) African tree often classified in other families; similar to the Costa Rican caracolito in wood structure as well as in fruit and flowers and leaves and seeds | - |
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| microcrystal | (noun) any crystal of microscopic size. | - |
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| secretaryship | (noun) the position of secretary | - |
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| tryst | (noun) a secret rendezvous (especially between lovers) | Synonyms: assignation |
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| (noun) a date; usually with a member of the opposite sex | Synonyms: rendezvous |