1. A substance, assuming various forms, composed of cellular tissue without any proper woody fibre.

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

• thalles,
• thalus,
• fhallus,
• yhallus,
• 6hallus,
• 5hallus,
• tballus,
• tnallus,
• tjallus,
• tuallus,
• tyallus,
• thzllus,
• thsllus,
• thallis,
• tnhallus,
• tahllus,
• thallos,
• thollus,
• thollos,
• thullus

• thales,
• tholos.

The adjective form of the word "thallus" is "thalloid".