Related Clues:

• It means ''internal''
• ''Inner'' starter
• Prefix denoting inside
• Root canal, in dentist-speak
• Exo-'s opposite
• It means "within"
• Prefix meaning "inside"
• Prefix meaning 'inner'
• Cardial opening
• Within: pref.
• Morph or scope preceder
• Inner prefix
• Morph or metric preceder
• Ecto's opposite
• Antonym of exo-