فرتنا doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• فَرْتَنَا

  فَرْتَنَا ذ , (M, K,) accord. to Ibn-Habeeb from فَرَتَ [q. v.], but accord. to Sb the ن is radical, (M,) or الغَرْتَنَا accord. to IB, (TA in art. فرتن,) The fornicatress, or adultress. (M and K in this art. * and in ar…

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• فَرْتَنَا

  فَرْتَنَا ذ , in which the ن is held by some to be radical, and by others to be augmentative, see in art. فرت.…

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