# Robertson screw

> English word · Noun

## Definitions
1. A type of screw having a square recess in the head.

## Etymology
From Canadian inventor P. L. Robertson (1879-1951).

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