# mark 1 eyeball

> English word · Noun

## Definitions
1. The naked eye.

## Etymology
In reference to mark 1; the designation commonly given to the first version of an invention, before the addition of any improvements or enhancements.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/mark-1-eyeball