1. (botany) outer tissue of bark; a protective layer of dead cells
   - cork

Derived forms: phellems

Type of: bark

• polyphonically
• polyphonous
• polyphony
• polyphosphate
• polyphosphoric acid
• polyphyletic
• Polyplacophora
• polyplacophore
• polyploid
• polyploidy
• Polypodiaceae
• Polypodiales
• Polypodium
• Polypodium aureum
• Polypodium glycyrrhiza
• Polypodium polypodioides
• Polypodium scouleri
• Polypodium virgianum
• Polypodium vulgare
• polypody
• polypoid
• Polyporaceae
• polypore
• Polyporus
• Polyporus frondosus