Where does “microaqueous” come from?

microaqueous (English) comes from English aqueous, from English -ous, from Middle English -ous, from Old French -us, from Latin -ōsus, from Old Latin -ōssus.

microaqueous (English): Containing a very small amount of water and mostly an organic solvent

Definitions

Containing a very small amount of water and mostly an organic solvent

Ancestry of “microaqueous”, step by step

microaqueous traces back through two separate lines of ancestry.

via English aqueous

Step	Language	Word	Meaning
1	English	aqueous	Consisting mostly of water
2	English	-ous	Used to form adjectives from nouns, to denote...
3	Middle English	-ous	—
4	Old French	-us	-ous, used for forming adjectives
5	Latin	-ōsus	ose, -ous, -ful (full of or overly prone to)
6	Old Latin	-ōssus	—

via English micro

Step	Language	Word	Meaning
1	English	micro	Small, relatively small; short form of...
2	Ancient Greek	μικρός	little, small
3	Proto-Indo-European	mēy-	soft, tender, dear

Every word from Old Latin -ōssus →