Related Clues:

• Prefix with -plasm
• Pot, slangily
• Prefix with ''skeleton'' or ''thermic''
• It means "outer"
• Skeleton head?
• Skeleton intro
• Pot, in slang
• It means ''internal''
• Lead-in for skeleton
• ''Inner'' starter
• Prefix denoting inside
• Root canal, in dentist-speak
• Outer-
• Outer: Pref.
• Exo-'s opposite