Where does “flathead” come from?

Flathead derives from English flat and head, with head tracing through Middle English heed and Old English hēafod to Frankish flatjan, ultimately from Proto-Indo-European roots.

flathead (English): Any fish in the Platycephalidae family;...

Definitions

  1. Any fish in the Platycephalidae family;...

Ancestry of “flathead”, step by step

flathead traces back through two separate lines of ancestry.

via English flat

StepLanguageWordMeaning
1EnglishflatHaving no variations in height; Without...
2Scotsfletinner part of a house
3Middle Englishfletthe floor, ground; a dwelling, habitation, house,...
4Old Englishfletthe floor, ground; a dwelling, habitation, house,...
5Proto-Germanicflatjąa level surface; level ground; the floor of a...
6Proto-Germanicflatazflat
7Proto-Indo-EuropeanplÁt-

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
Every word from Proto-Indo-European plÁt-Every word from Proto-Germanic flatazEvery word from Proto-Germanic flatją