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

Type of: thallus

• topee
• Topeka
• toper
• toper's nose
• topgallant
• topgallant mast
• topgallant sail
• Tophet
• tophus
• topi
• topiary
• topic
• topic sentence
• topical
• topical anaesthesia
• topical anaesthetic
• topical anesthesia
• topical anesthetic
• topical prostaglandin eyedrop
• topicalisation
• topicalise
• topicality
• topicalization
• topicalize
• topically