Where does “bissextile month” come from?

bissextile month (English) comes from English bissextile, from Latin bisextilis, from Latin bis, from Latin color, from Ancient Greek μέτρον, from Ancient Greek -τρον, from Proto-Hellenic -tron, from Proto-Indo-European -trom — Derives agent nouns from verbs, denoting someone...

bissextile month (English): A month with an extra day in a leap year

Definitions

  1. A month with an extra day in a leap year

Ancestry of “bissextile month”, step by step

bissextile month traces back through two separate lines of ancestry.

via English bissextile

StepLanguageWordMeaning
1EnglishbissextileHaving an intercalary day, "particularly" the...
2Latinbisextilisleap year, bissextile; intercalary
3Latinbistwice, two times, on two occasions, in two ways
4Latincolorcolour, shade; color; pigment; complexion
5Ancient Greekμέτρονsomething used to measure: measure, rule, weight;...
6Ancient Greek-τρονForms instrument nouns
7Proto-Hellenic-tronForms instrument nouns from verb stems
8Proto-Indo-European-tromForms nouns denoting a tool or instrument
9Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via English month

StepLanguageWordMeaning
1EnglishmonthA period into which a year is divided,...
2Middle Englishmonethmonth
3Old Englishmōnaþmonth
4Proto-Germanicmēnōþsmonth
5Proto-Indo-Europeanmḗh₁n̥smoon; month
6Proto-Indo-Europeanmeh₁-to measure
Every word from Proto-Indo-European -tḗrEvery word from Ancient Greek -τρονEvery word from Ancient Greek μέτρον
bissextile month — Etymology, Origin & Word History | Etymology Explorer