as·tro·ge·ol·o·gy 
(ăs′trō-jē-ŏlə-jē)
(ăs′trō-jē-ŏlə-jē)n.
The geology of celestial bodies.
as′tro·ge′o·logi·cal (-jē′ə-lŏjĭ-kəl) adj.
- protomorph
- protomorphic
- proton
- protonema
- protonemal
- protonematal
- protonic
- protonotary
- protonotary
- protonotary apostolic
- proton-proton chain
- proton pump inhibitor
- proton synchrotron
- proto-oncogene
- protopathic
- protopathy
- protoplanet
- protoplanetary disk
- protoplasm
- protoplasmal
- protoplasmatic
- protoplasmic
- protoplast
- protoplastic
- protoporphyrin