English
homosphere
From homo- + -sphere.
Proto-Indo-European *sperH- ‘to kick, rebound, move convulsively’
…
Latin sphaera ‘ball, globe, celestial sphere’
Late Latin sphēra
Old French sphere ‘sphere (shape)’
Middle English spere ‘the cosmos, outer space’
English sphere
Today it means
noun The lower part of the atmosphere, up to about 60 miles or 100 km, in which there is no great change in its composition.
Language periods are conventional ranges, not dates for this word.
Etymograph / homosphere