# CD4

> English word · Noun · frequency rank #39,729

## Definitions
1. A glycoprotein found on the surface of helper T cells and several other types of immune cells.
2. A CD4+ helper T cell.

## Etymology
Initialism of cluster of differentiation type 4.

## Easily confused with
- **co** (https://plainspell.com/en/vs/cd4-vs-co)
- **CM** (https://plainspell.com/en/vs/cd4-vs-cm)
- **CT** (https://plainspell.com/en/vs/cd4-vs-ct)
- **CR** (https://plainspell.com/en/vs/cd4-vs-cr)
- **ch** (https://plainspell.com/en/vs/cd4-vs-ch)
- **cs** (https://plainspell.com/en/vs/cd4-vs-cs)
- **Cl** (https://plainspell.com/en/vs/cd4-vs-cl)
- **CE** (https://plainspell.com/en/vs/cd4-vs-ce)
- **cp** (https://plainspell.com/en/vs/cd4-vs-cp)
- **CV** (https://plainspell.com/en/vs/cd4-vs-cv)
- **CU** (https://plainspell.com/en/vs/cd4-vs-cu)
- **CW** (https://plainspell.com/en/vs/cd4-vs-cw)
- **ci** (https://plainspell.com/en/vs/cd4-vs-ci)
- **CJ** (https://plainspell.com/en/vs/cd4-vs-cj)
- **CG** (https://plainspell.com/en/vs/cd4-vs-cg)
- **CX** (https://plainspell.com/en/vs/cd4-vs-cx)
- **cz** (https://plainspell.com/en/vs/cd4-vs-cz)
- **CQ** (https://plainspell.com/en/vs/cd4-vs-cq)
- **cut** (https://plainspell.com/en/vs/cd4-vs-cut)
- **cup** (https://plainspell.com/en/vs/cd4-vs-cup)

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/cd4