# pinhole

> English word · Noun · IPA /ˈpɪnˌhoʊl/ · frequency rank #53,777

## Definitions
1. A small hole, of a size that could have been made by a pin
2. The aperture in a pinhole camera or camera obscura
3. A port left unprotected by a firewall to allow a particular application to gain access to a service.
4. A clipping of pinhole eye, which refers to the compact eye structure associated with intense tropical cyclones.

## Etymology
From pin + hole.

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