رعراع 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.

• رَعْرَاعٌ

  رَعْرَاعٌ ذ The tall reed or cane, or tall reeds or canes, (K, TA,) in the place of growth thereof, while fresh: so accord. to Az, as heard by him from the Arabs. (TA.) -b2- And hence, as some say, or, accord. to others,…

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