Quadrilateral (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">quadrilateral</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that rectangle is a type of parallelogram)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rectangle that I've seen before include "Geometric figure with four right angles, not square" , "Four sides involved in this" , "Quadrilateral" , "box" , "Four-sided figure" .)