1) Angular 2) Angulate 3) Having four right angles 4) Meeting at right angles 1) Angulate 2) Oblong 3) Perpendicular 
• (a.) Right-angled; having one or more angles of ninety degrees.
Rec·tan'gu·lar adjective [ CF. French rectangulaire .] Right-angled; having one or more angles of ninety degrees. -- 
[adj] - having four right angles
rectangular Cross references of word families related directly, or indirectly, to: 'master, lead, leading, ruler, ruling, govern': -agogic; agon-; arch-; -crat; dom-; gov-; magist-; poten-; tyran-.
adjective having four right angles; `a rectangular figure twice as long as it is wide`