1. Rhomboidal.

2. A figure approaching to a rhomb; a quadrilateral figure, whose opposite sides and angles are equal, but which is neither equilateral nor equiangular.

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

• rhombix,
• ehomboid,
• dhomboid,
• fhomboid,
• thomboid,
• 5homboid,
• 4homboid,
• rgomboid,
• rbomboid,
• rhomboied,
• rhomboide,
• romboid,
• roombord,
• rhabboxd,
• prombood,
• Rhomboidron,
• Ringboid,
• Rhomboline,
• Seombroid,
• Rumboid

• rhomboidal.

The adjective form of the word "rhomboid" is "rhomboidal".

The plural of the "rhomboid" can be the "rhomboids".

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