| cinnabar | (adjective) of a vivid red to reddish-orange color | Synonyms: Chinese-red, vermilion, vermillion |
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| (noun) large red-and-black European moth; larvae feed on leaves of ragwort; introduced into United States to control ragwort | Synonyms: Callimorpha jacobeae, cinnabar moth |
| (noun) a heavy reddish mineral consisting of mercuric sulfide; the chief source of mercury | - |
| cinnamene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: phenylethylene, styrene, vinylbenzene |
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| cinnamon | (noun) spice from the dried aromatic bark of the Ceylon cinnamon tree; used as rolled strips or ground | - |
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| (noun) tropical Asian tree with aromatic yellowish-brown bark; source of the spice cinnamon | Synonyms: Ceylon cinnamon, Ceylon cinnamon tree, Cinnamomum zeylanicum |
| (noun) aromatic bark used as a spice | Synonyms: cinnamon bark |