# porin

> English word · Noun

## Definitions
1. Any of a class of proteins that cross cellular membranes and act as pores through which small molecules can diffuse

## Etymology
From pore + -in.

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