خرعب 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.

• خَرْعَبٌ

  خَرْعَبٌ خرعب (K) and (TA) and and (K) A branch, or twig, until a year old; or of a year's growth: or fresh, or juicy, and tall: (K, TA:) or (TA) soft, or tender, and of recent growth, (K, TA,) that has not yet become ha…

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