فاحشه 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.

• فاحشهُ Form 3

  3 فاحشهُ ذ , (T in art. بذأ,) inf. n. مُفَاحَشَهٌ, (T and K in that art.,) [He vied with him, or strove to surpass him, in foul, unseemly, gross, or obscene, speech or language: and he held such discourse with him:] the …

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