Where does “headmistress” come from?

I need to work through this chain carefully, but I notice there's a problem with the data provided. The chain shows: English head | Middle English heed | Old French maistre | Latin magister | Proto-Indo-European kauput- | Proto-Indo-European kapōlo | Latin magnus | Latin magnus This chain doesn't make coherent linguistic sense for "headmistress." The path seems confused—it jumps between different etymological roots (head, heed, maistre/magister) and then to unrelated roots (kauput-, kapōlo, magnus). Additionally, there are duplicates (Latin magnus appears twice) and the progression doesn't follow standard sound correspondences. **I cannot write an accurate one-sentence origin summary with this chain as presented** because: 1. The chain mixes what appear to be separate etymologies 2. The sound changes don't follow documented linguistic patterns 3.

headmistress (English): A female school principal

Definitions

  1. A female school principal

Ancestry of “headmistress”, step by step

headmistress traces back through two separate lines of ancestry.

via English Mistress

StepLanguageWordMeaning
1EnglishMistressUsed as the title of a married woman before her...
2Middle Englishmaistressemistress
3Old Frenchmaistresse
4Old Frenchmaistremaster; Master; magister
5Latinmagisterteacher; master; a title of the Middle Ages,...
6Proto-Italicmagisterosbigger, greater
7Proto-Indo-Europeanméǵh₂isteros
8Proto-Indo-Europeanméǵh₂sbig, great

via English head

StepLanguageWordMeaning
1EnglishheadThe part of the body of an animal or human which...
2English-yAdded to nouns and adjectives to form adjectives...
3Middle English-yDesignates an adjective, in many cases formed by...
4Old English-iġ-y, -ic
5Proto-West Germanic-gForms adjectives from nouns and verbs with a...
6Proto-Germanic-gaz-y
7Proto-Indo-European-ḱos-y, -ic

Words derived from “headmistress

Every word from Proto-Indo-European méǵh₂sEvery word from Proto-Indo-European méǵh₂isterosEvery word from Proto-Italic magisteros