proto-Earth
Astronomy
noun
The earth at an early stage of its development.
Origin
1950s; earliest use found in Science.
- military science
- Military Secretary
- military service
- military settler
- military tenure
- military time
- military tribune
- military two-step
- militate
- militia
- militia band
- militiaman
- militiawoman
- militician
- milium
- milk
- milk abscess
- milk and honey
- milk-and-water
- milk bag
- milk bank
- milk bar
- milkbar cowboy
- milk-blooded
- milk board