| diacetylmorphine | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: heroin |
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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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| diacritic | (adjective) capable of distinguishing | Synonyms: diacritical |
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| (noun) a mark added to a letter to indicate a special pronunciation | Synonyms: diacritical mark |
| diacritical | (adjective) capable of distinguishing | Synonyms: diacritic |
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