English
rontosecond
From ronto- + second.
Proto-Indo-European *sekʷ- ‘to follow’
Proto-Italic *sekʷondo-
Latin secundus ‘following’
Old French second
Middle English secunde
English second
Today it means
noun An SI unit of time equal to 10⁻²⁷ seconds. Symbol: rs
Sources
Sources: Wiktionary, “rontosecond”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / rontosecond