ar·bo·re·al \(ˈ)är|bōrēəl, (ˈ)ȧ|b-, -ȯr-\adjective alsoar·bo·re·an\-ēən\ Etymology: Latin arboreus + English -al or -an 1.: of or relating to a tree : resembling a tree 2.: inhabiting or frequenting trees < arboreal animals > • ar·bo·re·al·ly\-ēəlē, -li\adverb