1. Pertaining to the side of the body or the ribs.

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

• castal,
• coastel,
• cosal,
• coastall,
• coastal,
• coestal,
• cocxal,
• coytal,
• coomal,
• cortay,
• dostal,
• cstal,
• costad,
• costatu,
• costyl,
• crottalo,
• mostal,
• ostaal,
• ostyal,
• Cokkal

• coastline,
• coastal,
• costless,
• Costilow,
• costalgia,
• cocktail,
• coastland,
• costella,
• costilla,
• costley,
• Costales,
• crystal,
• castle,
• Costillo,
• costly,
• cost,
• postal,
• jostle,
• Costello.

The adjective form of the word "costal" is "coastal".

The plural form of the word "costal" is "costals".

The singular form of the word "costal" remains the same, as "costal" is already the singular form.