rectangle

Short definition from Wiktionary

Noun

1. 1
   Any quadrilateral having opposing sides parallel and four right angles.
2. 2
   Such a quadrilateral that is oblong (longer than it is wide): one that is not regular (equilateral), that is, any except a square.
3. 3
   A right angle.
4. 4
   The product of two quantities.

Adjective

1. 1
   Right-angled.