1. In the form of a tube.

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

• tubefirm,
• tubeform,
• Tebeform,
• gubiform,
• yubiform,
• 6ubiform,
• tybiform,
• thbiform,
• tjbiform,
• tibiform,
• t8biform,
• t7biform,
• tuviform,
• tuniform,
• tubifomr,
• Tubofirm,
• Tubiforme,
• Tubforim,
• Tubafirm,
• Tubfoirm

The adjective form of the word "Tubiform" is "tubular".

The plural form of the word "Tubiform" is "Tubiforms".

The singular form of the word "Tubiform" is "Tubiform". The word does not change between singular and plural form.