# propeller head

> English word · Noun

## Definitions
1. The hub of a propeller, into which the blades fit.
2. A person deeply absorbed in an academic field or technical interest, especially to the exclusion of social activities.

## Etymology
In reference to people, exemplified by the kind of child who wore a propeller beanie.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/propeller-head