Having eight sides (9)
I believe the answer is:
octagonal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">having eight sides</span>' is the definition.<br/ ><span class="explanation-format__explanation">(an octagon has eight sides)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for octagonal that I've seen before include "With many sides" , "In unusual shape" , "Having eight sides as in geometric figure" , "With eight sides and angles" , "Eight-sided" .)