Where does “rato” come from?

rato (Latin) comes from Latin ratus, from Latin rēōr, from Proto-Italic rēōr, from Proto-Indo-European h₂reh₁-, from Proto-Indo-European h₂er- — to fit, to fix, to put together.

rato (Latin): dative masculine singular of ratus; dative neuter...

Definitions

dative masculine singular of ratus; dative neuter...

Ancestry of “rato”, step by step

Step	Language	Word	Meaning
1	Latin	ratus	considered, having been considered; established,...
2	Latin	rēōr	to reckon, calculate
3	Proto-Italic	rēōr	to reckon, to calculate; to think, to deem, to...
4	Proto-Indo-European	h₂reh₁-	to think, reason; to arrange
5	Proto-Indo-European	h₂er-	to fit, to fix, to put together

Every word from Proto-Indo-European h₂er- →Every word from Proto-Indo-European h₂reh₁- →Every word from Proto-Italic rēōr →