# CD8

> English word · Noun · frequency rank #58,590

## Definitions
1. A glycoprotein found on the surface of cytotoxic T cells and several other types of immune cells.
2. A CD8+ cytotoxic T cell.

## Etymology
Initialism of cluster of differentiation type 8.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/cd8