1. A right - angled parallelogram.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• rectangleor,
• rectange,
• rectanglar,
• rectnagle,
• recatngle,
• rectrangle,
• reactangle,
• rectangels,
• rentangle,
• rectagle,
• prectange,
• rectanble,
• recangle,
• rectiangle,
• rectanglear,
• rectanges,
• recttangles,
• retangle,
• rectanguler,
• rectanle

• rectangular,
• rest on,
• reactance,
• reactant.

The adjective form of the word "rectangle" is "rectangular".

The plural of the "rectangle" can be the "rectangles".

The singular of the "rectangle" can be the "rectangle".