Where does “олигосахарид” come from?

олигосахарид (Russian) comes from Latin saccharum, from Ancient Greek σάκχαρ, from Sanskrit शर्करा, from Proto-Indo-Aryan śárkaraH, from Proto-Indo-Iranian ćárkaraH, from Proto-Indo-European ḱorkeh₂ — gravel, boulder; boulder; gravel.

Ancestry of “олигосахарид”, step by step

олигосахарид traces back through two separate lines of ancestry.

via Latin saccharum

Step	Language	Word	Meaning
1	Latin	saccharum	sugar
2	Ancient Greek	σάκχαρ	sugar; sugar cane
3	Sanskrit	शर्करा	gravel, grit, pebbles, shingle, gravelly mould or...
4	Proto-Indo-Aryan	śárkaraH	—
5	Proto-Indo-Iranian	ćárkaraH	—
6	Proto-Indo-European	ḱorkeh₂	gravel, boulder; boulder; gravel

via Ancient Greek ὀλίγος

Step	Language	Word	Meaning
1	Ancient Greek	ὀλίγος	Of small amount: few, little; Of small size:...
2	New Latin	chaeta	—
3	Ancient Greek	χαίτη	loose, flowing hair; used especially of back...
4	Proto-Indo-European	gʰeh₂it-	curly hair

Every word from Proto-Indo-European ḱorkeh₂ →Every word from Proto-Indo-Iranian ćárkaraH →Every word from Proto-Indo-Aryan śárkaraH →