مرخآء 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.

• مِرْخَآءٌ

  مِرْخَآءٌ ذ , applied to a beast, (دَابَّة, K,) or a horse or mare, (فَرَس, S,) and a she-camel, (TA,) and a she-ass, (S,) That runs in the manner termed إِرْخَآء: (K: [see 4, in the latter part of the paragraph:]) or …

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