Where does “миллионоугольник” come from?

миллионоугольник (Russian) comes from Russian миллио́н, from French million, from Middle French million, from Old French millon, from Italian milione, from Italian mille, from Latin Mīlle, from Proto-Italic smīɣeslī.

миллионоугольник (Russian): megagon

Definitions

megagon

Ancestry of “миллионоугольник”, step by step

миллионоугольник traces back through two separate lines of ancestry.

via Russian миллио́н

Step	Language	Word	Meaning
1	Russian	миллио́н	million
2	French	million	million, 10
3	Middle French	million	million, 10
4	Old French	millon	—
5	Italian	milione	million
6	Italian	mille	thousand
7	Latin	Mīlle	thousand; 1000
8	Proto-Italic	smīɣeslī	thousand
9	Proto-Indo-European	smih₂ǵʰéslih₂	—

via Russian у́гол

Step	Language	Word	Meaning
1	Russian	у́гол	angle; corner
2	Proto-Slavic	ǫgъlъ	corner, angle
3	Proto-Balto-Slavic	*ángulas	—
4	Proto-Indo-European	h₂engulos	joint?
5	Proto-Indo-European	h₂eng-	curve, bend

Every word from Proto-Indo-European smih₂ǵʰéslih₂ →Every word from Proto-Italic smīɣeslī →Every word from Latin Mīlle →