Related Clues:
- Opposite of "endo"
- Prefix for biology
- Prefix with -morphic
- Prefix for "plasm" or "derm"
- Endo's opposite
- __-1: "Ghostbusters" auto
- Outer: Pref
- Prefix with -thermic
- "Outside" prefix used in "Ghostbusters"
- Prefix with "plasm"
- Prefix denoting outside
- Skeleton opening
- Thermal opening
- Skeletal prefix
- Intro to biology?