# pneumolysin

> English word · Noun

## Definitions
1. A putative virulence factor of the gram-positive bacteria Streptococcus pneumoniae. It has a range of biological activity, including the ability to lyse and interfere with the function of cells and soluble molecules of the immune system.

## Etymology
From pneumo- + lyse + -in.

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