Related Clues:

• It means "within"
• Prefix meaning "inside"
• Prefix meaning 'inner'
• Cardial opening
• Within: pref.
• Plasm lead-in
• Morph or scope preceder
• Inner prefix
• Prefix for 'outer'
• Morph or metric preceder
• Ecto's opposite
• Antonym of exo-
• Plasm preceder
• Prefix with -scope
• Opening for outside?