Related Clues:

• ''Outer'' word form
• Outer opening
• Skeleton lead-in
• Prefix meaning ''outer''
• It means ''outside''
• Prefix for skeleton
• Prefix meaning 'outer'
• Plasm prefix
• Morph or plasm preceder
• Skeleton starter
• Endo- opposite
• Prefix with -plasm
• Start to morph
• It means "outer"
• Skeleton head?