Related Clues:

• The Ghostbusters' license plate, ___ 1
• Prefix for "parasite" or "plasm"
• Lead-in for skeleton
• Morph lead-in
• Outer-
• Outer: Pref.
• Oplasm opener
• Prefix meaning ''outside''
• Outer opening?
• Outside opening
• ''Skeletal'' prefix
• Plasm lead-in
• Prefix with ''carp'' or ''biology''
• Prefix for 'outer'
• Plasm preceder