# rontosecond

> English word · Noun · IPA /ˈɹɑn.toʊˌsɛk.ənd/

## Definitions
1. An SI unit of time equal to 10⁻²⁷ seconds. Symbol: rs

## Etymology
From ronto- + second.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/rontosecond