Where does “ultrafine” come from?

ultrafine (English) comes from English fine, from German fein, from Middle High German fīn, from Old French fin, from Latin fīnis, from Proto-Indo-European dʰnh₂-.

ultrafine (English): Very fine

Definitions

Very fine

Ancestry of “ultrafine”, step by step

Step	Language	Word	Meaning
1	English	fine	Senses referring to subjective quality; Senses...
2	German	fein	fine; fine; very good; as it should be; refined;...
3	Middle High German	fīn	—
4	Old French	fin	fine, delicate
5	Latin	fīnis	end
6	Proto-Indo-European	dʰnh₂-	—

Every word from Proto-Indo-European dʰnh₂- →Every word from Latin fīnis →Every word from Old French fin →