| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| arsenide | (noun) a compound of arsenic with a more positive element | - |
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| cyanide | (noun) an extremely poisonous salt of hydrocyanic acid | - |
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| (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: nitril, nitrile |
| encainide | (noun) antiarrhythmic drug (trade name Enkaid) used to treat life-threatening arrhythmias but increases the risk of sudden death in heart attack patients | Synonyms: Enkaid |
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| ferricyanide | (noun) salt of ferricyanic acid obtained by oxidation of a ferrocyanide | - |
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| ferrocyanide | (noun) salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate | - |
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| flecainide | (noun) oral antiarrhythmic medication (trade name Tambocor) used as a last resort in treating arrhythmias; increases the risk of sudden death in heart attack patients | Synonyms: Tambocor |
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| lanthanide | (noun) any element of the lanthanide series (atomic numbers 57 through 71) | Synonyms: lanthanoid, lanthanon, rare-earth element, rare earth |
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| nonidentity | (noun) Difference, distinction; failure to be identical. | - |
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| ozonide | (noun) any of a class of unstable chemical compounds resulting from the addition of ozone to a double bond in an unsaturated compound | - |
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| snide | (adjective) expressive of contempt | Synonyms: sneering, supercilious |
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| snidely | (adverb) with a sneer; in an uncomplimentary sneering manner | Synonyms: sneeringly, superciliously |
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| tocainide | (noun) antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed | Synonyms: Tonocard |
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| transactinide | (adjective) of or belonging to the elements with atomic numbers greater than 103 | - |
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| (noun) any of the artificially produced elements with atomic numbers greater than 103 | - |
| unidentifiable | (adjective) impossible to identify | - |
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| unidentified | (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unknown, unnamed |
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| (adjective) not yet identified | - |