صينى doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• صِينِىٌّ

  صِينِىٌّ ذ Of, or relating to, الصِّين [i. e. China]. (TA.) [Hence,] أَوَانٍ صِينِيَّةٌ, (K, TA,) and [the pl.] صَوَانِىُّ, (S,) Vessels of الصِّين, (S, K, TA,) made in the country thus called [i. e. China]. (TA.)…

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