English
Indosphere
From Indo- + -sphere.
Dutch Indo-Europeaan ‘Indonesian-European’
Dutch Indo ‘a person of partially native Indonesian and…’
English Indo
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
The story
Coined by James Matisoff in 1990 along with Sinosphere in his article "On Megalocomparison".
Today it means
noun Countries and regions in Asia that have been historically influenced by the culture of India.
Language periods are conventional ranges, not dates for this word.
Etymograph / Indosphere