Related Clues:
- Prefix meaning ''outside''
- Outer opening?
- ''Skeletal'' prefix
- It means "within"
- Prefix meaning "inside"
- Prefix meaning 'inner'
- Cardial opening
- Within: pref.
- Prefix with ''carp'' or ''biology''
- Morph or scope preceder
- Inner prefix
- Morph or metric preceder
- Ecto's opposite
- Antonym of exo-
- Prefix with -skeleton