proto-Earth
Astronomy
noun
The earth at an early stage of its development.
Origin
1950s; earliest use found in Science.
- cryptosporidium
- cryptostoma
- cryptosystem
- cryptous
- cryptovolcanic
- cryptoxanthin
- cryptozoa
- cryptozoic
- cryptozoological
- cryptozoologist
- cryptozoology
- cryptozoon
- cryptozoön
- cryptozygous
- cry someone/thing up (or down)
- crystal
- crystal axis
- crystal ball
- crystal chemistry
- crystal class
- crystal clear
- crystal clock
- crystal-controlled
- crystal cutter
- crystal detector