Where does “robi-” come from?

robi- (English) comes from English ronna-, from Ancient Greek ἐννέα — nine.

robi- (English): The IEC prefix meaning 290 = 1,0249 = 1,237,940,039,285,380,274,899,124,224. Compare ronna-, meaning 1027 = 1,0009 = 1,000,000,000,000,000,000,000,000,000, an octillion

Definitions

  1. The IEC prefix meaning 290 = 1,0249 = 1,237,940,039,285,380,274,899,124,224. Compare ronna-, meaning 1027 = 1,0009 = 1,000,000,000,000,000,000,000,000,000, an octillion

Ancestry of “robi-”, step by step

StepLanguageWordMeaning
1Englishronna-In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 1027 (a short scale octillion or long scale quadrilliard). Symbol: R
2Ancient Greekἐννέαnine

Words derived from “robi-

Every word from Ancient Greek ἐννέαEvery word from English ronna-
robi- — Etymology, Origin & Word History | Etymology Explorer