Where does “iridomotor” come from?

iridomotor (English) comes from English motor, from Middle English motour, from Latin motor, from Latin -tor, from Proto-Italic -tōr, from Proto-Indo-European -tōr, from Proto-Indo-European -tor-s.

iridomotor (English): Relating to the movement of the iris of the eye

Definitions

  1. Relating to the movement of the iris of the eye

Ancestry of “iridomotor”, step by step

iridomotor traces back through two separate lines of ancestry.

via English motor

StepLanguageWordMeaning
1EnglishmotorA machine or device that converts other energy...
2Middle Englishmotour
3Latinmotormover; that which moves something; first-person...
4Latin-tor-er
5Proto-Italic-tōrForms agent nouns to verb stems
6Proto-Indo-European-tōrDerives agent nouns from verbs, denoting someone...
7Proto-Indo-European-tor-s

via English irido

StepLanguageWordMeaning
1Englishirido
Every word from Proto-Indo-European -tor-s