Where does “irrégulier” come from?

irrégulier (French) comes from Middle French irregulier, from Latin irrēgulāris, from Latin rēgulāris, from Latin rēgula, from Latin -ula, from Proto-Indo-European -tlom, from Proto-Indo-European -trom, from Proto-Indo-European -tḗr — Derives agent nouns from verbs, denoting someone...

irrégulier (French): irregular; undependable; illegal

Definitions

  1. irregular; undependable; illegal

Ancestry of “irrégulier”, step by step

irrégulier traces back through two separate lines of ancestry.

via Middle French irregulier

StepLanguageWordMeaning
1Middle Frenchirregulierirregular
2Latinirrēgulārisirregular, unusual
3Latinrēgulārisductile (able to be formed into a bar)
4Latinrēgularule, bar
5Latin-ularegō + API → rēgula; tegō + API → tēgula;...
6Proto-Indo-European-tlomAlternative form of *-trom
7Proto-Indo-European-tromForms nouns denoting a tool or instrument
8Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via Late Latin irregularis

StepLanguageWordMeaning
1Late Latinirregularisirregular, unusual
2Latinin-un-, non-, not; in, within, inside
3Latininin, at, on, upon, from; within, while in; into,...
4Old Latinenin

Words derived from “irrégulier

Every word from Proto-Indo-European -tḗrEvery word from Latin -ulaEvery word from Latin rēgula