# mesosome

> English word · Noun

## Definitions
1. A folded invagination in the plasma membrane of bacteria, produced by the chemical fixation techniques used to prepare samples for electron microscopy, but previously thought to be part of the normal structure of the cell.

## Etymology
From meso- + -some.

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