English

irregulate

From ir- + regulate.

Proto-Indo-European *h₁én ‘in’

Proto-Germanic *in ‘into’

English in-

Proto-Indo-European *h₃reǵ- ‘to straighten’

…

Latin regō ‘to rule, govern’

Latin rēgula ‘rule’

Latin regulō ‘to direct, rule, regulate’

Latin regulatus ‘regulated, having been regulated’

Today it means

verb to make irregular; to disorder

Language periods are conventional ranges, not dates for this word.

Etymograph / irregulate