Where does “birdbrained” come from?

birdbrained (English) comes from English brained, from English brain, from Middle English brayn, from Old English bræġn, from Proto-West Germanic *bragn, from Proto-Germanic bragną, from Proto-Indo-European mregʰnom, from Proto-Indo-European men- — to think, mind; spiritual activity; to stay,...

birdbrained (English): Silly and frivolous; empty-headed

Definitions

  1. Silly and frivolous; empty-headed

Ancestry of “birdbrained”, step by step

birdbrained traces back through two separate lines of ancestry.

via English brained

StepLanguageWordMeaning
1EnglishbrainedHaving a particular kind or number of brain;...
2EnglishbrainThe control center of the central nervous system...
3Middle EnglishbraynThe brain or cerebrum; the organ of thought;...
4Old Englishbræġnbrain
5Proto-West Germanic*bragnbrain
6Proto-Germanicbragnąbrain
7Proto-Indo-Europeanmregʰnomskull, brain
8Proto-Indo-Europeanmen-to think, mind; spiritual activity; to stay,...

via English bird

StepLanguageWordMeaning
1EnglishbirdA member of the class of animals Aves in the...
2Middle Englishbrida young bird, a bird in general; Alternative form...
3Old Englishbriddyoung bird, chick; chicken
Every word from Proto-Indo-European men-