\Rec*tan"gu*lar\ (r?k*t?n"g?*l?r), a. [CF. F. rectangulaire.] Right-angled; having one or more angles of ninety degrees. -- {Rec*tan"gu*lar*ly} (r?k*t?n"g?*l?r*l?), adv. -- {Rec*tan"gu*lar*ness}, n.