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Definition of Impure s
1. Noun. In Italian, an ''s'' followed by another consonant. When used immediately before a masculine noun beginning with an impure s, the definite article changes from '''il''' to '''lo''' in the singular and from '''i''' to '''gli''' in the plural; the indefinite article changes from '''un''' to '''uno'''; the partitive article changes from '''dei''' to '''degli'''; and some adjectives and pronouns also change form.
''gn'', ''pn'', ''ps'', ''x'', ''y'', ''z'', and certain words starting with ''ch'' that are derived from French, are treated similarly. ¹
¹ Source: wiktionary.com