1. Thin crusty lichen thallus; adheres closely to or is embedded in the surface on which it grows

Type of: thallus

• knife blade
• knife fight
• knife pleat
• knife thrust
• knife-edge
• knife-handle
• knifelike
• knight
• knight bachelor
• knight banneret
• knight errantry
• Knight of the Round Table
• knight of the square flag
• Knight Templar
• knight's service
• knight-errant
• knighthood
• Knightia
• knightliness
• knightly
• kniphofia
• Kniphofia praecox
• Kniphofia uvaria
• knish
• knit